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How to enter service test diagnostic mode in Bosch WTMC dryers

Posted by Samurai Appliance Repair Man, in Dryer Repair 22 June 2013 · 1,177 views

Bosch dryer test mode

To enter/exit test program for WTMC dryers:
1. Rotate cycle selector knob to Off position.
2. Push and hold Start/Stop and Delicates buttons at the same time, then turn dryer on by rotating cycle selector knob either
direction -- keep holding Start/Stop and Delicates buttons until Start/Stop light flashes rapidly. Dryer is now in the test program.
3. When test program has been entered:
♦ Start/Stop light flashes rapidly.
♦ Select individual parts to test by rotating cycle selector knob.
♦ Once test has been selected, start test by pushing Start/Stop button. Start/Stop light will stay on continually while tests are
running. Push Start/Stop button again to end any test – rotating cycle selector knob stops all tests except Control
Elements test. Tests have finished once Start/Stop light flashes rapidly again.
♦ To exit test program, rotate cycle selector knob to Off position.
Fault
Code Fault Solution Notes Effect
E:11 Overheating due to clogged
lint filter/kinked hose.
Clean lint filter (& air duct if
necessary). Straighten kinked hose.
Displays E:01 during normal
use. Measures reduced air flow.
E:12 Severe overheating due to
clogged lint filter/kinked hose.
Clean lint filter (& air duct if
necessary). Straighten kinked hose.
Displays E:01 during normal
use. Measures reduced air flow.
E:13 Maximum drying time
exceeded
Check heater, control module, NTC's
& Hi-limit's. Usually faulty heater.
Can also be overloaded dryer.

Stops & displays E:03 during
normal use (after maximum
drying time limit of 240 minutes).
E:17 NTC error (NTC R3 @ lint
screen)
Check NTC R3 & wire harness.
Replace faulty part.
Typically shorted or opened wire
harness.
Dryer stops &
can't be restarted.
E:18 NTC error (NTC R2 @ heater) Check NTC R2 & wire harness.
Replace faulty part.
Typically shorted or opened wire
harness.
Dryer stops &
can't be restarted.
E:20 EEPROM error Replace faulty control module.Dryer stops &
can't be restarted.
E:21 Incorrect checksum Replace faulty control module.Dryer stops &
can't be restarted.
E:22 Invalid update Replace faulty control module.Dryer stops &
can't be restarted.
E:23 Model variant doesn't
match table
Replace faulty control module.Dryer stops & can't
E:24 Software version
doesn't match table
Replace faulty control module.Dryer stops & can't
E:25 Damaged data table Replace faulty control module.Dryer stops & can't
E:26 Control error Replace faulty control module.



Once in test mode, you can select the tests to run using this procedure:

Selecting WTMC / WTXD Dryer Tests

Test Position on knob WTMC33/WTXD53 WTMC63/65, WTXD83/85
View fault codes 1st position on right (cw) Extra Dry (Reg./Cot.) Extra Dry (Reg./Cot.)
Safety test2nd position on right (cw) Very Dry (Reg./Cot.) Very Dry (Reg./Cot.)
Display test (LED's/LCD's) 3rd position on right (cw) Regular Dry (Reg./Cot.) Regular Dry (Reg./Cot.)
Control elements test 4th position on right (cw) Damp Dry (Reg./Cot.) Damp Dry (Reg./Cot.)
Consumer test 5th position on right (cw) Air Fluff Very Dry (Mix)
Moisture sensor resistance measurement 6th position on right (cw) 20 min. Time Dry Regular Dry (Mix)
Sales demo program 7th position on right (cw) 40 min. Time Dry Air Fluff
240V:208V changeover 8th position on right (cw) 60 min. Time Dry Medium Time Dry
Automatic end-of-tape program 1st position on left (ccw) Very Dry (Perm. Press) Very Dry (Perm. Press)



Source: Bosch dryer wtmc3300us/01 lint filter light




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