STERO SG - TROUBLESHOOTING GUIDE MACHINE; No machine operation (no display); No machine operation (with display); Low temperature readings

TROUBLESHOOTING GUIDE MACHINE
Symptom
Possible Causes
No machine operation (no display).
1. Machine OFF.
2. Open fuse or circuit breaker off at power supply.
3. Cord not plugged in (corded models only).
4. L1 fuse F1 open. (120/60/1 and 120/208-240/60/1 and 3)
5. L1 fuse F4 open. (208-240/60/1 and 3)
6. 1T malfunction.
7. 2T malfunction. (208-240/60/1 and 3)
8. Power Supply Board malfunction.
9. Power Supply Board fuse F1 open.
10. Control Board malfunction.
11. Keypad malfunction.
No machine operation (with display).
1. ERROR CODES.
2. Keypad inoperative.
3. Control Board malfunction.
4. See
MACHINE WILL NOT FILL OR NOT FILL HIGH ENOUGH..
Low temperature readings.
1. Low water supply temperature.
2. Rapid cycle use.
3. Heavy ware load cools wash water.
4. Incorrect line voltage.
5. Booster heater or sump heater set low – See
SERVICE
PROGRAMMING (8934).
6. Temperature probes open or shorted.
7. High limits open.
8. Heater malfunction.
9. 1CR malfunction.
10. 1CON malfunction (hot machines)
11. Lime build up on heater.
12. Control Board malfunction.
Booster not heating.
(SU-H models ONLY)
1. Incorrect line voltage.
2. 2PRS malfunction including pressure sensor tubing and water trap.
3. Booster heater inoperative.
4. Temperature probe 3QTM open or shorted.
5. High limit 4TAS or 3TAS open.
6. 1CON malfunction.
7. Control Board malfunction.
SG, SU-L, SU-H DISHWASHERS - TROUBLESHOOTING
F45577 (1215) Page 56 of 59