Bosch Dryer/Washer models from WTA 35 to WTL 54 Fault Codes & Troubleshooting
Anti –
Crease/End
Light flashes
Problem- Time fault
(drying time too
long)
1 Control module failed.
2 Door lock failed.
3 Moisture sensor(s)
failed.
4 Water level switch
failed (WTL 5400
only).
5 Hi-Limit (“overheat”)
thermostat tripped and
failed to reset.
6 Supply voltage too low.
7 Check voltage at and wiring to
module. Turn off dryer, and
replace faulty module.
8 Check voltage at and wiring to
door lock. Turn off dryer,
measure door lock resistance and
replace faulty door lock.
Run moisture sensor conductance
test. Check voltage at and wiring
to sensors. Turn off dryer and
replace faulty sensor(s).
9 Check voltage at and wiring to
Hi-Limit. Turn off dryer, measure
Hi-Limit resistance and replace
faulty Hi-Limit.
10 Check voltage at and wiring to
Hi-Limit. Turn off dryer, measure
Hi-Limit resistance and replace
faulty Hi-Limit.
NOTE: Hi-Limit trips @ 248°F
(WTL 54) or 212°F (WTA 35)
11 Have customer upgrade power
system to provide consistent
voltage to dryer during heating
(need min. 198V).
E1
Pump failed
(WTL 5400
condensation dryer
only)
Problem- Pump failed. ???? Check voltage at and wiring to
pump. Turn off dryer, measure
pump resistance (110 – 136 ?)
and replace faulty pump.
Problem- Dryer won’t run
or indicator lights
won’t come on
(no power to
dryer)
???? Dryer not turned on.
???? No power to dryer
???? Dryer fuse has blown.
???? Turn “on/off” switch on.
???? Check customer circuit breaker,
fuse box or power connections.
???? Unscrew holder cap & replace
fuse (15A, type SC-15).
WTA 35 & WTL 54 Fault Codes & Troubleshooting
HINT: Use dryer test program to diagnose dryer problems.
HINT: Remove top panel of dryer to access wiring, control module and drum conductance
brushes.
Fault code Problem Possible Cause Suggested Action
Damp Dry
Light flashes
???? NTC # R3 failed
NOTE: When viewing
wiring diagram, see NTC
# R3.
???? NTC (temperature
sensor) failed.
???? Check voltage at and wiring to NTC.
Turn off dryer, measure NTC
resistance and replace faulty NTC.
NOTE: NTC resistances:
???? 9 – 11 k? @ 59°F – 221°F
Regular Dry
Light flashes
???? NTC # R2 failed
NOTE: When viewing
wiring diagram, see NTC
# R2.
???? NTC (temperature
sensor) failed.
???? Check voltage at and wiring to NTC.
Turn off dryer, measure NTC
resistance and replace faulty NTC.
NOTE: NTC resistances:
???? 18 – 22 k? @ 59°F – 392°F
Extra Dry
Light flashes
Problem- Heater (dryer
overheated)
? Heater failed.
? Drum motor failed.
???? Check voltage at and wiring to
heater. Turn off dryer, measure heater
resistance and replace faulty heater.
NOTE: Heater resistances:
? 62 – 67 ? (800W – E2 on wiring
diagram on page E-2)
? 25 – 29 ? (1900W – E3 on wiring
diagram)
? Check voltage at and wiring to drum
motor. Turn off dryer, measure
motor resistance and replace faulty
motor.
NOTE: Drum motor resistances (see
wiring diagram):
? 19 – 25 ? (between points X2.2 –
X2.3 for WTL 54)
? 18 – 23 ? (between points X2.2 –
X2.4 for WTL 54)
? 25 – 29 ? (between points X2.2 –
X2.3 for WTL 35)
? 25 – 30 ? (between points X2.2 –
X2.4 for WTL 35)
Servicing Safe Guards
To avoid personal injury and/or property damage, it is important that safe servicing practices be observed at all times. Examples of safe service practices are listed below but are not limited to the following:- Never attempt a product repair if you have any doubts as to your ability to complete the repair in a safe and satisfactory manner.
- Before servicing or removing an appliance:
- Disconnect power to the appliance.
- Turn off the gas / LP supply.
- Turn off the water supply.
- Never interfere with the proper operation of any safety device.
- Use only genuine factory replacement parts as substitutions may interfere with compliances to home safety codes or standards.
- It is extremely important that all safety ground connections be reestablished prior to the completion of the service call. Failure to do so will result in a hazardous condition being created.
- Prior to returning the appliance back into active service, ensure the following:
- All electrical connections are correct and secure.
- Electrical leads are properly dressed and secured away from sharp edges, high temperature components and moving parts.
- All non-insulated electrical terminals, connectors, heaters, etc. are adequately spaced away from metal parts or panels.
- All safety grounds (both internal and external) are correctly and securely connected.
- All access panels are properly and securely reassembled.