Current Sensor Module (Csm) - Haier GE GDF450P R0 Series Technical Service Manual

Current Sensor Module (CSM)

A CSM is a protective device located on the main control board. This device is designed to trip
if current leakage to ground is above 20mA ± 5mA is detected. The CSM functions similar to
commercially available GFCI's. If tripped, all control panel LED's will be flashing until the CSM is
reset. Entering Error Mode will allow the door status check with LED's flashing for 10 seconds with the
door open or on solid for 10 seconds, if the door is closed. The CSM is reset when Service Mode is
entered.
Cycling power to the dishwasher will also reset the CSM, allowing consumers to reset without a service
call. If the CSM re-trips, they should call for service to diagnose and repair the cause of the tripping
condition.
The cause of tripping is likely external to the board itself. The board should only be replaced after
all other diagnostic tests have been completed and all other potential causes have been ruled out.
Potential causes of current leakage to ground could be due to water leaking onto a live component, a
component malfunction, or a fault within the wiring harness. If water caused the CSM to trip, the leak
must be repaired. The dishwasher may run until a leak causes the trip to reoccur. Resetting the CSM
without fixing the underlying issue will likely result in a repeat call. Always perform a visual inspection
of the exposed heating element, looking specifically for cracks, splits, or swelling of the sheath.
CSM Diagnostics
NOTE: A normal water level must be present when checking the circulation pump, drain pump, and the
heater.
CSM is Tripped
Look for evidence of water leak under
the dishwasher, repair leak(s) as
needed and reset CSM
Start a Normal Cycle. Did CSM
trip immediately?
Yes
No
Check for water Leak(s), as
dishwasher is running in Normal
cycle does it leak?
Yes
causes CSM to Trip
Use Service
Mode to test
each load
Drain Pump causes
No
Repair leak and retest
– 45 –
Circulation Pump Replace Circulation
Replace Drain Pump
CSM to Trip
Heater causes
CSM to Trip
Pump
Replace Heater