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SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION
No Hot Water
1. No power to heater.
2. Blown water heater fuses.
3. Loose wire connections.
4. Inoperative heating elements.
5. Inoperative thermostat(s).
6. Open ECO.
7. Inoperative contactor(s).
1. Inoperative heating element.
2. Sediment or lime build up on element(s).
3. Thermostat(s) set to low.
4. Inoperative thermostat(s).
5. Inoperative contactor(s).
6. Loose wire connection.
7. High demand period.
8. Undersized heater.
9. Very cold inlet water to heater.
10. Plumbing connections reversed.
Not Enough Hot
Water or
Continues
Operation
Slow Hot Water
Recovery
1. Sediment or lime build up on element(s).
2. Loose wire connections.
3. Inoperative thermostat(s).
4. Inoperative contactor(s).
5. Derated heating element installed.
Over Heated
Water
1. Surface thermostat(s) not flush with tank.
2. Grounded heating element(s).
3. Thermostat set to high.
4. Inoperative thermostat(s).
5. Inoperative ECO.
1. Check circuit breakers at service panel.
2. Check water heater fuses.
3. Check all wire connections.
4. Check heating element(s).
5. Check thermostat(s) operation.
6. Reset (check) ECO.
7. Check contactor operation.
1. Check heating element(s).
2. Clean or replace heating element(s)
3. Increase thermostat setting.
4. Check thermostat(s).
5. Check contactor operation.
6. Check all wire connection.
7. Reduce demand.
8. Replace with larger heater.
9. Temper water to heater.
10. Correct plumbing connections.
1. Clean or replace heating elements.
2. Check all wire connections.
3. Check thermostat(s).
4. Check contactor operation.
5. Verify element voltage and wattage rating.
1. Check surface thermostat(s) mounting.
2. Check heating element(s).
3. Adjust thermostat(s) to desired setting.
4. Check thermostat(s).
5. Check ECO.
SERVICE
PROCEDURE
2. MCE-III, Page 17
4. MCE-I, Page 15.
5
. MCE-VII-IX, Page 21-23.
6. MCE-IV-VI, Page 18-20.
7. MCE-X, Page 24,25
1. MCE-I, Page 15.
2. MCE-XV, Page 30.
4. MCE-VII-IX, Page 21-23.
5. MCE-X, Page 24,25
1. MCE-XV, Page 30.
3. MCE-VII-IX, Page 21-23.
4. MCE-X, Page 24-25
5. See page 8.
1. MCE-XI, Page 26.
2. MCE-I, Page 15.
4. MCE-VII-IX, Page 21-23.
5. MCE-IV-VI, Page 18-20.
Page 14
Noisy (singing or
hissing) Elements
1. Lime formation on elements.
2. High or low line voltage.
1. Clean or replace heating elements.
2. Verify line voltage to heater.
1. MCE-XV, Page 30.
2. MCE-II, Page 16.
T
ROUBLESHOOTING
WARNING
High voltage exposure. Use caution when
making voltage checks to avoid hazard to
life or property.
Noisy Contactor
1. Low line voltage.
2. Debris between contactor plates.
3. Incorrect or defective operating coil.
4. Loose wire connections.
1. Verify line voltage to heater
2. Replace contactor.
3. Replace contactor.
4. Check wire connections.
1. MCE-II, Page 16
Quick Step Plan to Hot Water
1. STOP, DANGER! Turn power “OFF” to water heater.
2. Check all wire connections to insure they are snug
and corrosion free.
3. Reset high limit (ECO) (page 18-20).
4. Check for inoperative heating element (page 15).
5. Check line voltage (pg 16), and internal fuses (page 17).
6. Refer to table below if items 1 through 5 above do not correct problem.
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