STERO SG, Service And Parts Manual

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Symptom Possible Causes
Sump not heating.
1. Incorrect line voltage.
2. 1PRS malfunction including pressure sensor tubing and water trap.
3. Sump heater inoperative.
4. Temperature probe 1QTM open or shorted.
5. High limit 1TAS or 2TAS open.
6. 1CR malfunction.
7. Control Board malfunction.
Wash motor won't start.
1. Door open or door switch 1LS malfunction. If suspected, remove wire
from control board, jumper J10 to test functionality.
2. 1PRS malfunction including pressure sensor tubing and water trap.
3. Pump motor 1MTR inoperative.
4. Control board malfunction.
Machine will not fill sump or will not fill
high enough.
1. Rinse Relay K7 malfunction.
2. Switch Power Relay K11 malfunction.
3. Rinse Motor/Pump 2MTR inoperative.
4. 1PRS malfunction including pressure sensor tubing and water trap.
5. Control Board malfunction.
6. Booster/Holding Tank Water Level Sensor 2PRS inoperative including
pressure sensor tubing and water trap.
7. Door Switch 1LS inoperative.
8. 1PRS and 2PRS are wired backwards.
Machine fills too high.
1. Sump Water Level Sensor 1PRS malfunction including pressure sensor
tubing and water trap.
2. Booster/Holding Tank Water Level Sensor 2PRS malfunction including
hose and water trap.
3. Fill valve 1SOL malfunction.
4. DRAIN PUMP malfunction.
5. Drain hose clogged or kinked.
6. Control Board malfunction.
Machine won't stop when door is
opened.
1. Door switch 1LS inoperative.
2. Control board malfunction.
SG, SU-L, SU-H DISHWASHERS - TROUBLESHOOTING
Page 57 of 59 F45577 (1215)