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SECTION 4: TROUBLESHOOTING SECTION
COMMON PROBLEMS
WARNING: Inspection, testing and repair of electrical equipment should be performed only by qualified service personnel.
Certain procedures in this section require electrical tests or measurements while power is applied to the machine. Exercise
extreme caution at all times. If test points are not easily accessible, disconnect power, attach test equipment and reapply
power to test. When replacing electrical parts, disconnect power at source circuit breaker.
Problem: Water overflow from bottom of door.
1. Clogged drain. Remove obstruction.
2. Machine not level. Level machine, or increase height to the front.
3. Excessive inlet pressure. Install pressure reducing valve, or adjust if one is present. Ensure flow is 20A5 PSI.
4. Detergent foaming. Reduce detergent quantity.
Problem: Wash motor doesn’t operate on manual wash.
1. Loose or broken wires. Reconnect or replace wires in motor.
2. Defective manual wash switch. Replace.
3. Defective motor starting relay. Replace.
Problem: Motor operates on manual wash but not on automatic.
1. Defective timer. Replace timer.
2. Defective circuit in manual wash switch. Replace switch.
Problem: No water comes through the rinse arms when the “START CYCLE” switch is depressed.
1. Water not turned on. Turn water on.
2. Defective solenoid valve. Replace solenoid valve.
3. Probes are dirty or coated. Clean probes.
4. Defective water level control. Replace.
Problem: Little or no water coming through the rinse assemblies.
1. Limed up rinse heads or piping. Delime rinse heads.
2. Low water pressure. Increase pipe size to machine. Adjust pressure regulator.
Problem: Rinse water runs continuously with breaker turned off.
1. Defective plunger in solenoid valve. Replace.
2. Defective diaphragm in solenoid valve. Replace diaphragm.
Problem: Rinse doesn’t operate on automatic during timed cycle (but does operate in auto/fill operation).
1. Timer defective. Replace timer.
Problem: Rinse water runs continuously with power applied to machine, but when circuit breaker to machine is turned
off, water stops.
1. Defective water level control. Replace.
2. Probes are dirty or coated. Clean probes.
Problem: Wash temperature not at required reading on thermometer.
1. Defective thermometer. Replace.
2. Defective thermostat. Adjust thermostat. Replace thermostat.
3. Rinse heater defective. Replace heater element.
4. Water level protection control device. Replace.
JPX-300NSU Technical Manual
7610-002-75-96 Rev. E (08/16/2005))