GE Spacemaker GSM1800J Series Technical Service Manual page 31

Troubleshooting the Wash Pump Motor
The wash pump motor does not start immediately
when the dishwasher cycle has started. The tub
will begin filling with water and the motor will start
approximately 40 seconds into the fill cycle. If the
motor hums, but will not start, make certain the
pump impeller is free from obstructions and the
motor shaft can turn freely. If the capacitor is
open or shorted, the motor will hum and will not
start. Check for 120 VAC (±10%) at the wash
pump motor terminals. Take the voltage
measurement while "under load" (as the motor is
trying to start). This will eliminate the possibility of
a poor wiring connection. If the 120 VAC (±10%)
is present and the motor will not start, the motor
will have to be replaced.
Wash Pump Motor Strip Circuit
PRESSURE
SWITCH
Troubleshooting the Water Fill Valve
If the water fill valve is suspected of faulty
operation, refer to the strip circuit and proceed as
follows:
1. Disconnect dishwasher from electrical supply.
2. Remove screws securing bottom of service
panel.
3. Remove valve electrical leads and, using
ohmmeter, check resistance of solenoid. (See
Specifications for correct ohms reading.)
4. To check for proper mechanical operation of
the water valve, attach a separate 115 volt
grounded power source to the valve terminals
and metal frame of the dishwasher. Turn the
power on for a few seconds and then turn the
power off. If water flow does not stop within 2
seconds after turning the valve off, replace the
water valve.
No Water To Tub
1. Be sure the main water supply and electrical
power are turned on.
2. Remove both the service panel and the kick
panel.
3. Advance timer to the fill position and latch the
door.
4. Start the dishwasher.
5. Use a voltmeter to check for voltage at the
water fill valve solenoid coil.
6. If voltage is present, disconnect power and
measure resistance of the water fill valve
solenoid coil. (See Specifications for correct
ohms reading.) Replace the water valve, if it
is defective.
7. If the water fill valve is good, check the filter
screen and clean it, if necessary.
8. If there is no voltage present at the water fill
valve solenoid coil, disconnect power and
check continuity through the latch switch,
timer contacts, float switch, and wiring.
Repair wiring, as necessary.
Water Level Too Low
1. Turn on the dishwasher and allow the bottom
of the basin to fill with water. Listen for the
water fill cycle to stop and, when it does, open
the dishwasher door. The water level should
touch the heating element.
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