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TROUBLESHOOTING
DISPLAY SHOWS
POSSIBLE CAUSES
1. Low or no water pressure.
2. Faulty inlet valve or fill relay.
3. Contactor to booster heater not turning off.
"F1 Service needed,"
4. Faulty temperature input (P12) on IO
"No water in Booster"
module.
5. Faulty temperature probe (T3).
6. Faulty float switch allows heaters to
operate with no water in tub.
1. Contactor to booster heater not turning off.
"F2 Service needed,"
2. Faulty temperature input (P12) on IO module.
"Check booster
thermostat"
3. Faulty temperature probe (T3).
1. Malfunction of fill solenoid or fill relay.
"F3 No water in wash
tank," "Check inlet
2. Door is open, which inhibits fill mode.
water and door"
3. Faulty door switch.
1. Incoming power not properly connected.
"F4 Service needed,"
"Check incoming
2. L3 is missing (3-phase units only).
power"
1. Faulty temperature input (P12) on IO
module.
"F5 Service needed,"
2. Faulty temperature probe (T3).
"Check booster thermo-
stat and high limit"
3. Faulty high-limit switch.
4. Faulty booster heater.
5. Booster-heater contactor not energizing.
19
FAULT CODES
REMEDY
1. Verify incoming water pressure is 8–12 PSI.
2. Verify that fill relay is supplying voltage to fill solenoid.
Replace faulty component.
3. Check for welded contacts. Verify that output from IO
module turns off when above the set temperature.
4. Substitute a 1.2 kΩ resistor for T3, and verify that booster
heater turns off. If not, replace IO module.
5. Verify that the booster-probe resistance is correct with
respect to temperature. (See Table 1.) If not, replace T3.
6. Replace float switch.
1. Check for welded contacts. Verify that output from IO
module turns off when above the set temperature.
2. Substitute a 1.2 kΩ resistor for T3, and verify that booster
heater turns off. If not, replace IO module.
3. Verify that the booster probe resistance is correct with
respect to temperature. (See Table 1.) If not, replace T3.
1. Replace faulty component.
2. Close door to activate door switch.
3. Replace or adjust door switch.
1. Check connections to heater.
2. Verify that L3 is present and connected properly.
1. Substitute a 1.8 kΩ resistor for T3, and verify that booster
heater turns on. If not, replace IO module.
2. Verify that T3 resistance is consistent with Table 1. If not,
replace T3.
3. Replace high-limit switch.
4. Check booster heater for proper resistance. Replace if
incorrect.
5. Verify that drive voltage to contactor coil is present
during a call for heat and that contactor closes. If voltage is
present, replace contactor. If voltage is not present, check
wiring.
07610-004-29-29-A
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