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How to enter service test diagnostic mode in Bosch WTMC dryers

Samurai Appliance Repair Man

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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