TROUBLESHOOTING GUIDELINES
WATER HEATER CONTROL
TROUBLE SHOOTING
Please check guidelines below. For your safety, water heater service should be performed only by a qualified service technician.
Read the GENERAL SAFETY INFORMATION section first.
# | LED STATUS | PROBLEM | SOLUTION | ||
1 | A | B | C | Inadequate or no earth ground | 1. Ensure the wall outlet is properly grounded. |
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| sensed by the | 2. Ensure all ground connections/wires on the | |
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| control. | |
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| water heater are secure. |
2 | A | B | C | Power supply to | 1. Ensure the wall outlet is properly wired. |
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| control has reversed polarity or a | 2. Ensure all internal 120 VAC wiring connections and | |
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| high resistance to earth ground. | |
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| wiring harness have no reversed wires. 120 VAC |
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| “hot” wire must connect to the on/off switch. |
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| 3. Ensure the wall outlet is properly grounded. |
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| 4. Ensure all ground connections/wires on the water |
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| heater are secure. |
3 | A | B | C | Pressure switch circuit remaining | 1. Ensure air pressure switch circuit wiring is correct |
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| closed for more than 5 seconds | and the air pressure switch is not jumpered. | |
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| after heating cycle begins. | 2. Secure power to water heater, check continuity of air |
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| Blower does not start. | |
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| Service Note: | pressure switch contacts with wires disconnected. |
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| A If pressure switch contacts show continuity (closed | |
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| Disconnect power - disconnect one | |
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| wire from the air pressure switch | circuit) replace the pressure switch. |
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| or the vent temperature limit | B If pressure switch contacts are open and all wiring |
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| switch. Turn power back on - | |
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| blower should start. | is correct - turn the power off for |
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| then on again to clear the error code - if the error |
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| code persists replace the |
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4 | A | B | C | Pressure switch circuit remains open | 1. Ensure the blower is running - check for 120 VAC to |
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| longer than 5 seconds after the blower | the blower when the heating cycle begins, check the | |
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| is energized. | wiring. If the control does not energize the blower - |
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| Blower may run continuously in | replace the |
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| start when energized - replace the blower assembly. | |
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| this condition. | 2. Ensure the air pressure switch sensing tube is properly |
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| connected - not kinked or damaged. |
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| 3. Check continuity of vent temperature limit switch - replace |
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| switch if contacts remain open under 160ºF (71°C). |
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| Service Note: | 4. Ensure the correct size of vent pipe (2”, 3”, 4”) was used |
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| per installation manual for vent length. Ensure maximum | |
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| To learn more about performing Air | number of elbows or equivalent feet of vent pipe has not |
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| Pressure Switch tests visit our web | exceeded maximum limits. |
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| site www.hotwater.com to download | 5. Ensure there are no obstructions in the vent pipe. |
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| technical bulletin | |
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| Switches. | 6. Check air pressure switch performance - check pressure |
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| with a digital manometer - check continuity of contacts. |
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| (see service note in left column) If the switch proves |
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| defective - replace the air pressure switch and or the |
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| blower assembly as required. |
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| 7. If air pressure switch performance test results prove |
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| the air pressure switch is working properly and error |
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| code 4 persists - replace the |
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| A | B | C | The | 1. Check wiring to the hot surface ignitor - replace ignitor |
5 |
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| an open ignitor circuit. | assembly if wiring is damaged or worn. | |
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| Service Note: | 2. Check ignitor assembly plug and the socket on the |
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| The resistance (ohms) of a hot surface | |
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| ignitor will increase over time. If the | ignitor assembly and/or control if necessary. |
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| resistance at room temperature is near | 3. Check resistance of ignitor at room temperature 77ºF |
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| 18.8 ohms - consider replacing the ignitor | |
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| as a preventative measure. | (25°C) at the plug end. Replace ignitor if resistance |
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| is not within 11.5 and 18.8 ohms at room temperature. |
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| 4. If results from the above tests were good and error |
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| code 5 persists - replace the |
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