Bosch WFMC64 Repair Manual page 22

22
WFMC Service Tips
WFMC Service Tips
Symptom
Washer won't start.
Washer won't fill.
Washer won't drain.
WARNING!
before starting any repairs.
702_58300000133618_ara_en_a
Problem
Electricity is disconnected
or has been turned off.
Cycle selector knob or
control module has failed.
Water supply turned off.
Water inlet hose filters
(strainers) blocked.
Water pressure too low.
Control module has
failed.
Water inlet valve(s) has
failed.
Drain pump or pump
motor protector has
failed.
Control module has
failed.
Unplug washer
– Troubleshooting (1)
– Troubleshooting (1)
Solution
Make sure washer is connected to an appropriate 120V, 60 Hz
circuit (according to local codes). Turn on electricity.
Control module has onboard cycle selector knob.
voltage output to water inlet valves and drum motor (when
they're energized). If no voltage, replace faulty control module.
Turn on water supply.
Check water inlet hose filters. Clean if dirty. Replace filters if
damaged.
Check incoming water pressure.
Check voltage output to water inlet valves (when they're
energized). If no voltage, replace faulty control module.
Measure resistance of water inlet valves (~ 2.7 – 4.5 kΩ).
Replace inlet valve(s), if faulty.
Disconnect drain pump and measure resistance at connector
(~ 140 – 200 Ω). Replace drain pump if faulty.
Check voltage output to drain pump when it's energized. If no
voltage, replace faulty control module.
The washer test program diagnoses
HINT:
problems quickly and thoroughly where resistance
measurements usually aren't needed.
Check
Rev 0 (1/17/08)