G7881
Technical Information
FAULT CODES
G7881
© 2007 Miele USA
1

G7881
Technical Information
G7881 Dental Disinfector Table of Contents
6.6 Fault Repair...
..3
6.6.1 Fault Indication Without Flashing Or Lit Fault LED’s ...
..3
6.6.2 Fault Indication With Flashing Or Lit Fault LED’s ...
.3
6.6.3 Door Seal Bulges...
..5
6.6.4 Door Cannot Be Locked ...
...5
6.6.5 Temperature Limiter F2 (Thermostat) Has Cut-out ...
.5
6.6.6 Repetitive Heater Element Fault In Cabinet ...
...6
6.6.7 No Water Intake...
.6
6.6.8 Flow Meter Minimum/Maximum Number Of Pulses Not Achieved ..7
6.6.9 Heating Level Switch Does Not Switch On...
..7
6.6.10 Premature Failure Of Circulation, Dispenser Or Drain Pumps ...
..7
6.6.11 Circulation Pump Does Not Start...
..8
6.6.12 Wash Cycles Take Longer To Heat Water ...
..8
6.6.13 Load Does Not Dry ...
..8
6.6.14 Fault Codes ...
.9
G7881 Dental Disinfector List of Tables
Table 6-36: Fault Codes (Continue on Table 6-37)...
..9
Table 6-37: Fault Codes (Continue from table 6-36) (Continue on Table 6-38)...
..10
Table 6-38: Fault Codes (Continue from table 6-37) (Continue on Table 6-39)...
..11
Table 6-39: Fault Codes (Continue from table 6-38) (Continue on Table 6-40)...
..12
Table 6-40: Fault Codes (Continue from table 6-39) (Continue on Table 6-41)...
..13
Table 6-41: Fault Codes (Continue from table 6-40) (Continue on Table 6-42)...
..14
Table 6-42: Fault Codes (Continue from table 6-41) (Continue on Table 6-43)...
..15
Table 6-43: Fault Codes (Continue from table 6-42)...
.16
2

G7881
Technical Information
6.6
Fault Repair
6.6.1
Fault Indication Without Flashing Or Lit Fault LED’s
General Information
All faults registered by the electronic unit that do not involve water intake
or drainage, or the dispenser systems are saved in a fault code
memory and not indicated via any warning LED’s. The last 3 detected
faults are saved provided they are different. The most recently registered
fault code is only stored if a different fault code (or no fault code) is
already saved. This prevents the possibility of the same fault being
recorded 3 times. The fault memory can be deleted via service mode 2.
6.6.2
Fault Indication With Flashing Or Lit Fault LED’s
General Information
If a fault is registered for which one of the 5 fault LED’s is provided, then
the appropriate LED flashes at a frequency of 1 Hz and at the same time
a fault code to aid further diagnosis is displayed in the digital display. The
fault code is not saved in the fault memory. The program sequence
indicator showing the stage the program has reached when the fault was
detected remains active. When the program selector switch is turned to
the 12 o’clock setting, the fault display is deleted and a new program can
then be selected and started normally.
If a fault is registered before program start, e.g. an activated dispenser
check registers an empty container, the appropriate fault LED e.g. DOS,
flashes after program selection and the program cannot be started.
Water Intake/Drainage Fault LED
With these faults the top LED Intake/Drain flashes and the program is
interrupted. At the same time one of the following fault codes are
indicated in the digital display:
3

G7881
Technical Information
F 0E
After a delay of 5 seconds a flow meter in the water intake does not
provide a minimum of 5 pulses within the next 2 seconds.
If no pulses are registered during the first water intake in a program with
legally fixed cleaning parameters, then the program will only advance to
the next step if the heating level switch switches to register sufficient
water level. If it does not switch, the fault code F 0E is displayed.
In the test program the delay time has been extended from 5 seconds to
23 seconds as in this case it may be necessary for the appliance water
paths to be filled.
F 1E
The water intake is switched off within 5 minutes even though the number
of pulses for the set water intake quantity has not been registered
In programs (first water intake only) with legally fixed cleaning parameters
a minimum water quantity is not monitored. To advance from the water
intake step the heating level switch must have switched to register
sufficient water level. If it does not switch, the fault code F 1E is displayed
if the pulses from the flow meter are registered or the fault code F 0E is
displayed when no pulses are detected.
F 2E
During water intake a flow meter provides sufficient pulses but the
quantity of water required is not taken in during the given time of 5
minutes.
F 3E
2 seconds after the water intake step the heating level switch is monitored
for 2 seconds. If it has not switched, the step is not advanced and the
fault code F 3E is displayed. After a voltage interruption in the appropriate
step, the heating level switch is not checked again. As it is possible to set
a desired water quantity of 5.5 liters or 5 liters via programmable function
E 01 in wash blocks VR1, VR2, SP2, and SP3, then with a desired water
quantity less than or equal to 6 liters this fault monitoring is not active.
Salt Fault Indicator LED
4

G7881
Technical Information
If insufficient salt is registered in the salt container, the fault indicator LED
Recharge softener lights up. The program is not interrupted.
F 23
If reactivation is carried out for a second time after a lack of salt has been
registered, the fault indicator LED flashes and the fault code F 23 is
displayed. This fault is also recorded via the printer interface.
6.6.3
Door Seal Bulges
Cause
ƒ Improper detergent use over time may cause damage to the seals
in the appliance. Also the use of rinsing agents (when these
contain paraffin oils) in the final rinse can cause the seal to swell
after only a short period of time.
Remedy
ƒ Use a different detergent.
ƒ To protect seals, disinfecting, alkaline detergents with a high
proportion of active chlorine should not be used at temperatures
above 80ºC.
6.6.4
Door Cannot Be Locked
Cause
ƒ Door seal incorrectly fitted and protrudes forward.
ƒ Locking plate not correctly adjusted.
Remedy
ƒ Remove the door seal and fit correctly.
ƒ Adjust locking plate.
6.6.5
Temperature Limiter F2 (Thermostat) Has Cut-out
5

G7881
Technical Information
Cause
ƒ The heating relay contacts (1K1/1 or 2K1/1) have fused together.
ƒ Excessive foam developed in suds.
Remedy
ƒ Check heating relay contacts for continuity when they are not
activated.
ƒ If continuity exists, replace the appropriate relay.
ƒ Check quantity of rinse aid dispensed.
ƒ Use a different rinse aid.
6.6.6
Repetitive Heater Element Fault In Cabinet
Symptom
ƒ Short-circuit and/or body contact at heater elements.
Cause
ƒ Over long periods excessively foaming suds may cause the heater
elements to fail. May be caused by using non-Miele-approved
detergent. A check can be made during washing by using the
clear door.
Remedy
ƒ Replace the heater element.
ƒ Use only detergents recommended by Miele.
6.6.7
No Water Intake
Symptom
ƒ Water intake only starts after rotation of the circulation pump has
been registered.
Cause
ƒ Circulation pump does not start.
ƒ Waterproof system WPS valve does not open.
Remedy
ƒ Check circulation pump for power or mechanical failure.
ƒ Check speed sensor B3/9.
ƒ Refer to fault code F 0E.
6

G7881
Technical Information
6.6.8
Flow Meter Minimum/Maximum Number Of Pulses Not
Achieved
Cause
ƒ Flow meter clogged by lime scale.
ƒ Reed switch defective.
Remedy
ƒ If clogged by lime scale, change flow meter.
ƒ Check the reed switch for correct operation and seating.
ƒ Check the reed switch connections and plugs.
ƒ If necessary change the reed switch.
Note:
The flow meter is behind the temperature limiter F2.
6.6.9
Heating Level Switch Does Not Switch On
Cause
ƒ Heating level switch does not react to water pressure.
ƒ Excessively foaming detergent or rinse aid in the wash water. This
reduces the wash water pressure developed by the circulation
pump and applied to the heating level switch.
Remedy
ƒ Check the switching point and continuity of the heating level
switch.
ƒ Replace the heating level switch if necessary.
ƒ Use a different detergent or rinse aid.
6.6.10
Premature Failure Of Circulation, Dispenser Or Drain Pumps
Symptom
ƒ After a short period of operation the pumps listed leak and seals
swell up.
Cause
ƒ Possible dispensing of rinsing agent in the final rinse in order to
lubricate metal joints in the items being processed. If the rinsing
agent contains paraffin oils, the lifetime of components with a
sealing function is reduced.
Remedy
ƒ Avoid using rinsing agents that contain paraffin oils.
ƒ Use a Miele-approved rinsing agent.
7

G7881
Technical Information
6.6.11
Circulation Pump Does Not Start
Cause
ƒ Circulation pump motor winding too hot and the winding protection
device 1F3 has tripped (it resets automatically after approximately
10 minutes). Foreign bodies may be blocking the pump.
ƒ Operating capacitor C6 defective
Remedy
ƒ Check the circulation pump for correct operation.
ƒ Check the circulation pump connection plug at the electronic unit.
ƒ Check the circulation pump housing for foreign bodies, jammed
motor, etc. Remove the pump housing if necessary.
ƒ Check the plugs on the operating capacitor and the motor block
for correct fitting.
ƒ Replace the operating capacitor C6 if necessary.
6.6.12
Wash Cycles Take Longer To Heat Water
Cause
ƒ Heater element defective.
ƒ Heating relays 2K1/1 or 1K1/1 do not switch.
Remedy
ƒ Check heater element for continuity.
ƒ Replace the faulty heater element.
ƒ Check solenoid voltage (6 V DC).
ƒ Check plug connections
ƒ Check solenoid for continuity.
ƒ Check contacts for continuity.
6.6.13
Load Does Not Dry
Cause
ƒ Heater relay 1K1/1 does not switch.
ƒ Heater element R1 defective.
Remedy
ƒ See also “Wash Cycles Take Longer To Heat Water”.
ƒ Check heater element R1 for continuity.
ƒ If necessary replace heater element R1.
8

G7881
Technical Information
6.6.14
Fault Codes
Fault
Symptom
Cause
Remedy
Code
Machine functioning
F 00
No registered fault
None
correctly
Check on site stop cocks
Check filters in waterproof
Minimum number of
system valves
pulses (5) not
No water intake
registered within the
Check hoses for kinks and
F 0E
first 7 seconds. The
blockages
program is
Check waterproof system
interrupted.
No pulse provided by
See “Flow meter min/max.
flowmeter
number of pulses not achieved”
Water is taken in but
See “Flow meter min/max.
pulses are irregular
number of pulses not achieved”
and the overflow level
switches the water
supply off before the
Check overflow level switch for
maximum number of
correct operation.
Maximum number
pulses have been
of pulses during
registered.
water intake not
Check on site stop cocks
F 1E
reached within 5
In programs with
minutes. Water
Check hoses for kinks and
legally fixed cleaning
intake is switched
blockages
parameters, the
off
heating level switch
Check circulation pump for
has not switched
correct operation
during the water
Check circulation pump for
intake. Insufficient
blockages
pulses have been
registered.
Check heating level switch for
correct switching position
Check water pressure of on site
cold and hot water supplies
Water intake is not
completed within
Check on site stop cocks
the given time of 5
Desired water intake
Check hoses for kinks and
F 2E
minutes. The
quantity not reached
blockages
program is
interrupted.
Exchange restrictor insert in the
waterproof system for a larger
version.
Table 6-36: Fault Codes (Continue on Table 6-37)
9

G7881
Technical Information
Fault
Symptom
Cause
Remedy
Code
Check circulation pump for
correct operation
Check connection plugs and
leads
Check heating level switch for
Heating level switch
Heating level switch
correct switching point (2
F 3E
has not switched
defective
seconds after circulation pump
after water intake
starts at rated speed)
Check circulation pump
connection hoses for blockages
See also “Heating level switch
does not switch on”
Check water inlet valve for
correct operation
Exchange waterproof system unit
Flow meter provides
if necessary
pulses during a
Appropriate water
Check if voltage is applied to
F 4E
non-water intake
intake valve is open
water inlet valve when machine
step
is switched off
If voltage is applied to water inlet
valve when machine is switched
off, exchange electronic unit
The heating level
Check drain pump
switch has switched
Residual water still in
F A
Check drain hoses for kinks or
after a drainage
cabinet
blockages
step
Even though the
Fill salt container with
The insufficient salt
insufficient salt warning
reactivation salt
warning indicator
F SA
LED has been lit,
has been ignored
reactivation salt has
for too long
See also “Fault Code F 23”
not been added
During dispensing
no medium flow has
been detected. A
float switch for flow
Dispenser pump not
F do
Prime the dispenser pump
monitoring (B8) is
primed
not fitted as
standard in the
G7881 - G7883.
Coarse filter operating
Change Coarse Filter on drying
S F1
hours warning
unit
Table 6-37: Fault Codes (Continue from table 6-36) (Continue on Table 6-38)
10

G7881
Technical Information
Fault
Symptom
Cause
Remedy
Code
Temperature limiter F2
(thermostat) resetting
Temperature limiter F2
If necessary, exchange the
has cut out
temperature limiter, see
“Temperature limiter F2
(thermostat) exchange”
Wash water
“Heater element check”
temperature T1 in
Heater elements do
If necessary, exchange the
wash block HR1
not heat up
heater elements, see “Heater
F 01
(main wash) not
element removal”
reached within 60
minutes
Heating level switch
See also “Heating level switch
does not switch
does not switch on”
Voltage (6 VD) from
Check plug connections
the electronic unit not
present. The heating
Check electronic unit output
level switch controls
voltage
the heating relay
voltage
Temperature Limiter F2
(thermostat) resetting
Temperature limiter F2
If necessary, exchange the
has cut out
temperature limiter, see
“Temperature limiter F2
(thermostat) exchange”
“Heater element check”
Wash water
Heater elements do
temperature T2 in
If necessary, exchange the
not heat up
heater elements, see “Heater
F 02
wash block NS2 not
reached within 60
element removal”
minutes
Heating level switch
See also “Heating level switch
does not switch
does not switch on”
Voltage (6 VDC) from
Check plug connections
the electronic unit not
present. The heating
level switch controls
Check electronic unit output
the heating relay
voltage
voltage.
Table 6-38: Fault Codes (Continue from table 6-37) (Continue on Table 6-39)
11

G7881
Technical Information
Fault
Symptom
Cause
Remedy
Code
Check leads and plug
Water NTC sensor or
F 04
connections
its leads open-circuited
Exchange leads if necessary
Check leads and plug
Water NTC sensor or
F 05
connections
its leads short-circuited
Exchange leads if necessary
“Speed senor B3/9 check”
Check leads and plug
The speed sensor
connections
B3/9 does not
Speed sensor
Check correct seating of speed
provide any pulses
defective
sensors on circulation pump
F 08
though they are
required (e.g. with
Check voltage supply
gentle start
Exchange speed sensor if
mechanism)
necessary
Circulation pump
See “Circulation pump does not
blocked
start”
Changeover from
mains operation to
operation with
None
emergency power
Mains frequency not
supply or on-site power
registered. Applies
supply.
particularly to
buildings with their
Check the sine wave oscillation
own on-site power
F 09
of the mains frequency carry out
supply or where
appropriate corrective measures
there is insufficient
to stabilize the mains frequency
filtering of high-
Unstable mains
frequency mains
frequency
With irregular sine wave or
interference.
unstable mains frequency carry
out appropriate corrective
measures to stabilize the mains
frequency
Table 6-39: Fault Codes (Continue from table 6-38) (Continue on Table 6-40)
12

G7881
Technical Information
Fault
Symptom
Cause
Remedy
Code
Failure of one or more
F 10
optical selector switch
Exchange electronic unit
LEDs
The additional
Check the buss leads and plug
module can not be
connections
F 11
Bus leads defective
addressed via the
Exchange electronic unit if
I 2 C bus
necessary
See “Drying unit fan inoperative”
Drying temperature
See “Drying temperature not
has not been
Fan in drying unit (TA)
reached” See “Air from drying
F 12
reached (warning
is defective
unit is not warm” See “Drying unit
and fault indication)
fan operates too slowly” See
“Drying unit fan does not start”
The serial interface
(RS 232) cannot be
Electronic unit
F 13
Exchange electronic unit
addressed via the
defective
I 2 C bus
Check mains fuse and repair any
Mains fuse has tripped
possible short circuits
An impermissible
A possible changeover
mains failure was
F 14
registered when a
from mains operation
to operation with
cleaning program
None
was in operation
emergency power
supply or own supply
has taken too long
The external
electronic module
TUE has registered
that the desired
F 17
None
temperature has
been exceeded.
This only applies to
model G7783CD
Table 6-40: Fault Codes (Continue from table 6-39) (Continue on Table 6-41)
1
CD Models only.
13

G7881
Technical Information
Fault
Symptom
Cause
Remedy
Code
Temperature limiter F2
(thermostat) resetting
Temperature limiter F2
If necessary, exchange the
has cut out
temperature limiter, see
“Temperature Limiter F2
(thermostat) exchange”
“Heater element check”
Wash water
Heater elements do
temperature T4 in
If necessary, exchange the
not heat up
heater elements, see “Heater
F 18
wash block HR2
not reached within
element removal”
60 minutes
Heating level switch
See also “Heating level switch
does not switch
does not switch on”
Voltage (G VDC) from
the electronic unit not
Check plug connections
present. The heating
Check electronic unit output
level switch controls
voltage
the heating relay
voltage
Water check NTC
Check leads and plug
sensor or its leads
connections
F 20
short-circuited
Exchange leads if necessary
(monitoring processor)
Water check NTC
Check leads and plug
sensor or its leads
connections
F 21
open-circuited
Exchange leads if necessary
(monitoring processor)
Temperature variation
Check leads and plug
between the two NTC
connections
sensors too large
Exchange leads if necessary
Compare resistance values of
One of the NTC
both NTC sensors
sensors has incorrect
F 22
resistance
Exchange an NTC sensor if
necessary
Objects in the cabinet
could prevent the flow
Redistribute objects in the
of wash water to a
cabinet
sensor
Table 6-41: Fault Codes (Continue from table 6-40) (Continue on Table 6-42)
14

G7881
Technical Information
Fault
Symptom
Cause
Remedy
Code
Triac failure. The
speed sensor
provides pulses
Control module
F 24
Exchange control module
even though the
defective
circulation pump is
not activated.
Heating level
switch has
Check heating level
Exchange heating level switch if
F 25
switched before a
switch switching points
necessary
program has
started
Float switch B8/3
Water present in drip
Check machine for leaks (hoses,
F 26
(overflow) has
tray
seal etc)
switched
Temperature limiter F2
(thermostat) resetting
Temperature limiter F2
If necessary, exchange the
has cut out
temperature limiter, see
“Temperature limiter F2
(thermostat) exchange”
Desired
“Heater element check”
temperature in one
Heater elements do
If necessary exchange the heater
of the wash blocks
not heat up
F 27
elements, see “Heater element
VR, SP1, SP2,
removal”
SP3 or SP4 not
Heating level switch
See also “Heating level switch
reached
does not switch
does not switch on”
Voltage (6 VDC) from
Check plug connections
the electronic unit not
present. The heating
Check electronic unit output
level switch controls
voltage
the heating relay
voltage
Undefined fault in
F --
Exchange electronic unit
electronic unit
Table 6-42: Fault Codes (Continue from table 6-41) (Continue on Table 6-43)
15

G7881
Technical Information
Fault
Symptom
Cause
Remedy
Code
The water drainage check
From machine No. 18131352
20 seconds after the start
a different heater pressure
of the water intake step is
monitor (2400/700) has been
carried out by checking the
fitted
heater pressure monitor
Water drainage
(HDW). With a high mains
Water
fault approximately
water supply pressure and
Exchange the existing heater
Drain
20 seconds after
at the same time a high
Fault
start of water
opening tolerance of the
pressure monitor (1500/700)
with Mat No. 04441453 for
intake step
inlet valves, too much
the heater pressure monitor
water may flow into the
(2400/700) with Mat No.
machine. The heater
05419710.
pressure monitor
(1500.700) switches too
early
Table 6-43: Fault Codes (Continue from table 6-42)
16



Miele Fault Codes

  Miele Dishwasher Fault Codes  
F01 Water/heating NTC or leads short-circuited After this fault is registered, the heating will not be activated and rinse aid will not be dispensed. At the end of the program, the display shows Technical fault F01. The buzzer is activated for 2 minutes.

Cause:
NTC temperature sensor R30 or its connection leads short-circuited.

Remedy:

1. Check the temperature sensor and its leads for continuity. At 68°F (20°C), the temperature sensor resistance should be approximately 14.9kΩ (± 750Ω); at 77°F (25°C), approximately 12kΩ (± 600Ω) (guide figures only).

2. Check the plug connections.

3. Replace the temperature sensor, if necessary.
F02 Water/heating NTC or leads open-circuited  After this fault is registered, the heating will not be activated and rinse aid will not be dispensed. At the end of the program, the display shows

Technical fault F02. The buzzer is activated for 2 minutes.

Cause:
NTC temperature sensor R30 or its connection leads open-circuited.

Remedy:

1. Check the temperature sensor and its leads for continuity. At 68°F (20°C), the temperature sensor resistance should be approximately 14.9kΩ (± 750Ω); at 77°F (25°C), approximately 12kΩ (± 600Ω) (guide figures only).

2. Check the plug connections.

3. Replace the temperature sensor, if necessary.;
F11 Drainage fault Water present in appliance and is not being drained off. The display shows

Drain fault F11. The buzzer is activated for 2 minutes.

Background information:
After each drain pump step, the circulation pump operates for 2 seconds and heater pressure switch B1/13 checks the water level. If it is too high (large quantity of residual water remaining in the cabinet), the drainage time is extended. If, after a further check, the water level is still too high, then the program is interrupted, the fault code is saved and the drain pump is activated. Fault code F11 is also registered if heater relay 1K1 is not activated after the fault code F51 register check; see Section 080-3.18. Drain hose kinked. Remedy: Check the drain hose for correct positioning. Cause: Drain blocked.

Remedy:

1. Clean the on-site drain.
2. Check the sump drain.
3. Check the filters.
4. Check the heater pressure switch and replace it if necessary.

Cause:
Ball in non-return valve in sump has not opened (e.g., jammed).

Remedy:
Clean the non-return valve in the sump or replace it if necessary. Cause: Foreign objects in the drain pump.

Remedy:
Clean the drain pump and its impeller.

Cause:
Drain pump defective.

Remedy:

1. Check the voltage supply to the drain pump.
2. If correct voltage is present, check the drain pump motor winding.
3. Replace the drain pump, if necessary.

Cause:
Foreign objects in heater pressure switch.

Remedy:
Check the heater pressure switch for blockages and correct switching point.

Cause:
Heater relay defective. Heater relay (coil or contacts) becomes defective during the drainage step (after fault code F51 register check).

Remedy:
Replace the heater relay.
F12 Water intake fault at start of step During the first 5 seconds of any water intake step, at least 15 pulses from flow meter B3/4 should be registered. If this given number of pulses is not detected, the display shows the message

Water intake fault and the Status LED flashes. The water inlet valve will be activated at 10-second intervals for one hour. The drain pump will also be activated at intervals to prevent the possibility of the appliance overflowing. All other components remain inactive. If these attempts to achieve the minimum pulse rate fail, the buzzer is activated for 2 minutes.

Cause:
On-site shutoff valve (water supply) closed.

Remedy:
Open the shutoff valve.

Cause:
On-site water supply not in order.

Remedy:
The on-site water supply should be checked by a specialist.

Cause:
Flow meter B3/4 is not providing any pulses.

Remedy:

1. Check WaterProof System (WPS) valve Y2 (filter, restrictor disc).
2. Remove the left side panel.
3. Check that the plate with the reed switch on flow meter B3/4 is seated correctly.
4. Check that the reed switch connection plug is seated correctly.
5. Replace the reed switch, if necessary.
6. Check the control lead from the electronic to flow meter B3/4.
7. Replace the water inlet mixer, if necessary.

Cause:
Water inlet valve defective.

Remedy:
Check the water inlet valve and replace it if necessary.

Cause:
Electrical connection open-circuited.

Remedy:

1. Check the wires to the flow meter reed switch for continuity.
2. Check the plug connections.
F13 Water intake fault: Heater pressure switch he program is interrupted and the drain pump is operated. The display shows the message Water intake fault F13. After approximately 2 to 4 minutes, the buzzer is activated for 2 minutes. This fault is registered when the desired number of pulses, which varies depending on program, has not been detected within a certain given time (maximum 4 minutes). If the selected program starts with a water softener flushing cycle, the fault code register check is carried out earlier. In the event of a fault, the selected program is interrupted after approximately 30 seconds and the fault is indicated.

Cause:
On-site water supply not in order.

Remedy:
The on-site water supply should be checked by a specialist.

Cause:
Water inlet valve defective.

Remedy:
Check the water inlet valve and replace it if necessary.

Cause:
Flow meter B3/4 is providing too few pulses.

Remedy:

1. Check WPS valve Y2 (filter, restrictor disc).
2. Remove the left side panel.
3. Check that the plate with the reed switch on flow meter B3/4 is seated correctly.
4. Check that the reed switch connection plug is seated correctly.
5. Replace the reed switch, if necessary.
6. Check the control lead from the electronic to flow meter B3/4.
7. Replace the water inlet mixer, if necessary.

Cause:
Water flow pressure at on-site water supply is less than 14.5 pounds per square inch (1 bar).

Remedy:

1. Check the water intake.
2. If voltage is present at the electronic for the solenoid valve, check the solenoid valve Y2 leads for continuity.
3. Check the filter at WPS valve Y2.

Cause:
Filter in WPS clogged.

Remedy:

1. Disconnect the machine from the power supply.
2. Close the on-site water supply.
3. Unscrew the WPS from the on-site water supply.
4. Remove the washer from the threaded union.
5. Remove the filter with needlenose pliers.
6. Clean or replace the filter as necessary.
F14 Water intake fault: Heater pressure switch The program is interrupted and the drain pump is operated. The display shows the message Technical fault code F14 - Call Service Dept. The buzzer is activated for 2 minutes. With the circulation pump operating after a water intake step, the heater pressure switch is checked to ensure that sufficient water pressure exists in the wash water circuit. For this the heater relay must have been activated.

Cause:
Heater pressure switch B1/13 defective.

Remedy:

1. Check the heater pressure switch.
2. Check the connection plug and wiring harness.
3. Replace the heater pressure switch, if necessary.

Cause:
Circulation pump inoperative. Circulation pressure too low (no pressure at heater pressure switch). Pump may be blocked by foreign objects.

Remedy:
1. Check the circulation pump for foreign objects.
2. Check the circulation pump capacitor.
3. Replace the circulation pump, if necessary.

Cause:
Foreign objects in heater pressure switch.

Remedy:
Replace the heater pressure switch.

Cause:
Flow meter B3/4 defective (incorrect water quantity registered).

Remedy:

1. Check that the plate with the reed switch on flow meter B3/4 is seated correctly.
2. Check that the reed switch connection plug is seated correctly.
3. Replace the reed switch, if necessary.
4. Check the control lead from the electronic to flow meter B3/4.
5. Remove the water inlet mixer and replace if necessary.

Cause:
Circulation pump defective.

Remedy:

1. Check the circulation pump power supply.
2. Check the circulation pump capacitor.
3. Replace the circulation pump.

Cause:
Circulation pump winding overheated; winding protection has cut out.

Remedy:
Replace the circulation pump.

Cause:
After a water intake step, heater pressure switch B1/13 has not opened switching steps 11–12 and 21–22. This starts the anti-stiction routine.

Remedy:
Replace the heater pressure switch.

Cause:
Motor capacitor defective.

Remedy:
Check the motor capacitor and replace it if necessary.

Cause:
Contacts on heater pressure switch B1/13 short-circuited. Contamination on the plug of the heater wiring harness and a conductive connection between the plugs and the main harness causes a short circuit to the contacts.

Remedy:

1. Replace the heater wiring harness.
2. Replace heater pressure switch B1/13.
3. Reconnect the two individual plugs from the main harness (AMP 6.3 x 0.8) and apply new insulation sleeves. Do not interchange the plugs.
F15 Water intake fault: Hot water  
F18 Flow meter stationary state monitor B3/4 The program is interrupted and the drain pump is operated. The display shows the message Technical fault code F18 - Call Service Dept. The buzzer is activated for 2 minutes. The water inlet valve is open when it should not be (a signal to open it has not been given by the electronic). Water then flows into the appliance and unexpected pulses from flow meter B3/4 are detected. Unexpected pulses from flow meter B3/4 are also detected when the water inlet valve is not activated.

Cause:
Water inlet valve defective.

Remedy:
Check the water inlet valve and replace it if necessary.

Cause:
Interference pulses.

Remedy:
Replace the water inlet mixer.
F19 Flow meter B3/4 stiff and not turning freely The program is interrupted and the drain pump is operated. The display shows Technical fault F19. Call the Service Department. The buzzer is activated for 2 minutes. Background information: Satisfactory test routines to monitor free rotation of the flow meter impeller could not be established. Technical Information
37
G 1202

Wash block water intake start:
a Measuring time for 0.26 gallons (one liter)

1 Normal water intake time sufficient (1 minute in this example)

2 Extended water intake time required (2 minutes in this example).

3 After 0.26 gallons (one liter) intake, it is clear that neither the normal nor

the extended water intake time will be sufficient. Therefore, the test routine is started.

Test routine:

a Measuring time for 0.26 gallons (one liter)

b Test routine successful; water intake time is extended.

c Test routine unsuccessful; fault code F19 is registered.

a. During the first step, water intake solenoid Y2 is activated in order to let another 0.52 gallons (2 liters) flow into the machine. The required time is calculated on the basis of the time that the 0.26 gallons of water already in the machine required for intake.

Note: The volume of water cannot cause the machine to overflow, even if the flow meter is inaccurate. Circulation pump M6 is now activated for 2 minutes in order to wet the dishes in the dishwasher and to fill any spaces with water. Drain pump M8 is then activated for one minute. This creates a measurement basis for the actual test. During the test, water inlet valve Y2 is activated until a defined number of pulses corresponding to a water volume of approximately 0.37 gallons (1.4 liters) is reached. Circulation pump M6 is then activated once more.

b. The program continues to run without interruption. The maximum water intake time is extended to 4 minutes. This time value is saved by the electronic for future water intake. For future water intakes, if the time needed for 0.26 gallons to flow into the machine differs by 15 percent, a new test routine flow will be started.

c. If heater pressure switch B1/13 is activated, the program is interrupted immediately, the drain pump is operated, and fault F19 is registered.

Cause:
Flow meter defective.

Remedy:
Replace the water inlet mixer.
F24 Heater relay contact The program is interrupted and the drain pump is operated. The display shows Technical fault F24. Call the Service Department. The buzzer is activated for 2 minutes.

Background information:
When the circulation pump is not operating, the heater relay contacts are checked. If supply voltage is then applied to the electronic’s inputs, the fault is registered.

Cause:
Heater relay contacts have fused together.

Remedy:
Replace the heater relay.

Cause:
Moisture in heater relay.

Remedy:
Replace the heater relay.

Cause:
Fault in the plug on the exit side of the heater relay. Contamination on the plug of the heater wiring harness causes resistance values between the contact blades to fall below 10 megaohms (10MΩ).

Remedy:

1. Disconnect the appliance from the power supply.

2. Disconnect plug 5 from the electronic.

3. Measure the resistance between the lines of the electronic for heater pressure switch B1/13 (pins 12 and 22 on plug 5).

4. If the measured resistance value is smaller than 10 megaohms (10MΩ), then the heater wiring harness must be replaced.
F25 Desired temperature fault At the end of the wash program, the display shows the message Technical fault code F25 - Call Service Dept. The Status LED flashes. The buzzer is activated for 2 minutes. During the heating stage, the desired temperature has not been reached within the given time (minimum 75 minutes). In subsequent wash blocks, after this fault has registered, the heating is not activated and no rinse aid is dispensed.

Cause:
Heater defective.

Remedy:
Replace the heater.

Cause:
Heater relay defective.

Remedy:

1. Check the heater relay solenoid.

2. Check the heater relay solenoid voltage (12VDC) from the electronic.

3. Replace the electronic, if necessary.

Cause:
Excess quantity of detergent or rinse aid dispensed. Excess foam has developed.

Remedy:
Check the dispensed quantities of detergent and rinse aid. Follow the information given in the operating instructions.
F26 Boiling protection The program is interrupted and the drain pump is operated. The display shows Technical fault F26. Call the Service Department. The buzzer is activated for 2 minutes.

Cause:
Temperature at NTC temperature sensor has exceeded 194°F (90°C).

Remedy:
Check the heater relay and replace it if necessary.

Cause:
NTC temperature sensor providing inaccurate information.

Remedy:
Replace the NTC temperature sensor.

Cause:
Heater relay closed.

Remedy:
Replace the heater relay.
F40 Electronic fault The program is interrupted and the drain pump is operated. The display shows Technical fault F40. Call the Service Department. The buzzer is activated for 2 minutes.

Cause:
The electronic has a fault that cannot be repaired by the service department (such as a hardware fault).

Remedy:
Replace the electronic.
F42 Line frequency registration fault The program is interrupted and the drain pump is operated. The display shows Technical fault F42. Call the Service Department. The buzzer is activated for 2 minutes. A check is carried out to ensure that the line frequency is within certain valid ranges (50 ± 5 Hz or 60 ± 5 Hz). This fault is registered when it cannot clearly be established which valid range is applicable.

Cause:
Main power supply not in order.

Remedy:
The main power supply should be checked by a specialist.
F47 Mains frequency registration fault  
F51 Heater pressure switch The program is interrupted and the drain pump is operated. The display shows Technical fault F51. Call Service Department. The buzzer is activated for 2 minutes.

Background information:

Start position: One second after the program start, heater relay K1/1 is activated. This enables a check as to whether the contacts on heater pressure switch B1/13 have closed on switching steps 21/22 or 11/12.

Cause:
Heater relay defective; contact open.

Remedy:
Replace the heater relay.

Cause:
Heater relay solenoid defective.

Remedy:
Replace the heater relay.

Cause:
Connection from heater relay to electronic module open-circuited.

Remedy:

1. Check plug connections.

2. Check the connection wires for continuity.

Cause:
Heater pressure switch open- or short-circuited.

Remedy:
Replace the heater pressure switch.

Cause:
Connection from heater pressure switch to electronic open-circuited.

Remedy:

1. Check plug connections.

2. Check the connection wires for continuity.

Cause:
Foreign objects in heater pressure switch.

Remedy:
Replace the heater pressure switch.
F52 Heater pressure switch has reset during heating The program continues from the wash block in which the fault is registered without the heating being activated. The fault will only be indicated when the fault code memory is checked in the service mode.

Cause:
Excess quantity of detergent or rinse aid dispensed. Excess foam has developed.

Remedy:
Check the dispensed quantities of detergent and rinse aid. Follow the information given in the operating instructions.

Note:
A check should also be made to ensure that the type of detergent used matches the setting. When, for example, combination products (2-in-1 or 3-in-1 tablets) are used but the corresponding parameter has been set to Normal, rinse aid will be dispensed twice.

Cause:
Heater pressure switch defective.

Remedy:
Replace the heater pressure switch.

Cause:
Pump pressure too low.

Remedy:
Clean the circulation pump and remove any foreign objects that may be present.

Cause:
An item has tipped over and a large quantity of water is retained, e.g., in a bowl, and is then not available for the wash water circuit. This reduces the pump pressure.

Remedy:
Follow the loading information given in the operating instructions.
F53 Speed sensor fault  
F63 Slide shutter fault  
F67 Circulation pump speed to slow  
F68 Circulation pump operation after switch off  
F69 Circulation pump blocked The program is interrupted and the drain pump is operated. The fault will be indicated in the display or via LEDs. The buzzer is activated for 2 minutes. With the circulation pump operating, the heater pressure switch contacts are checked. For this, the heater relay must have been activated and both electronic’s inputs must be potential-free.

Cause:
Heater pressure switch defective.

Remedy:
Replace the heater pressure switch.

Cause:
Circulation pressure too low; circulation pump is blocked by foreign objects.

Remedy:
Clean the circulation pump and remove any foreign objects that may be present.
F70 Float switch fault After the WaterProof System has activated, the program is interrupted and the drain pump is operated. The fault will be indicated in the display or via LEDs. The buzzer is activated for as long as the fault is detected.

Note: The drain pump continues to operate even after the appliance has been shut off. The drain pump can only be deactivated by disconnecting the power supply connection.

Cause:
Water in the drip pan. Changeover contact of overflow float switch B8/3 closed from 1 to 4 (refer to the wiring diagram).

Remedy:

1. Remove the water from the drip pan (e.g., with an absorbent cloth).

Note:
Upon opening the appliance and removing all water, there should be no smudges, smears or traces of deposits. Take pictures of any deposits, if possible, and note their type (rust, calcium, detergent, or salt?).

2. Check all hoses, connections and threaded unions for leaks.

Note:
If the leak source has not yet been detected, check the following areas in the toekick and the drip pan for wear and tear: 􀂃 Connection between the circulation pump and the sump 􀂃 Axial face seal of the circulation pump 􀂃 Connection between the drain pump and the sump 􀂃 Connection between the salt container and the water intake 􀂃 Connection between the water intake and the cabinet side wall 􀂃 Overflow (e.g., excess foam formation) 􀂃 Water level between the overflows (􀃆 seating of the lower door seal?) 􀂃 Connection between the cabinet and the salt container 􀂃 Non-return valve in the sump (􀃆 water running back from the drain hose?)

3. Check overflow float switch B8/3 for continuity and correct operation.

4. Carefully dry all electrical components in the drip pan area.

Cause:
Float switch defective.

Remedy:
Replace overflow float switch B8/3.

Cause:
Drip pan warped after transport.

Remedy:

1. Remove the drip pan.

2. Bend the drip pan straight or replace it if necessary.
F84 Slide shutter positioning fault  
F85 Slide shutter signal change fault  
F86 Salt container lid contact fault  
F87 Sensor softener fault  
F88 Turbidity sensor fault If this fault is registered, the program is not interrupted. The fault will only be indicated when the fault memory is checked in the service mode. If this fault is registered, the program continues with default settings.

Cause:
False or no values from turbidity sensor.

Remedy:

1. Check the turbidity sensor for correct function.

2. Replace the spray arm feed pipe with turbidity sensor, if necessary.

Cause:
Foreign objects in the measurement path.
Remedy:
Check the feed pipe and replace it if necessary.

Cause:
Turbidity sensor connection wires open-circuited.

Remedy:
Check the connection wires for continuity.
F91 Load size registration inactive