CONTROL DISPLAY TROUBLESHOOTING
ELECTRONIC CONTROL DISPLAY
Please check guidelines below. For your safety, water heater service should be performed only by a qualified service person.
Read the GENERAL SAFETY INFORMATION supplied by the water heater manufacturer.
| CONTROL DISPLAY STATUS | PROBLEM |
| SOLUTION |
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1. | “POWER” Flashing |
| 1. | Check the |
Communication Error |
| runs between the upper and lower | ||
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| The system has detected a |
| controls. Check that the wiring is not |
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| broken, and the connectors on both ends | |
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| communication error between the |
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| are properly seated in the mating | |
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| upper and lower controls. |
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| connectors. | |
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| 2. | Replace the upper control, if the problem |
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| persists: |
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| 3. | Replace the lower control. |
2. | “HEATING” and “SHORT” Flashing |
| 1. | Turn the power off for 10 to 20 seconds |
The |
| then on again to clear the error code. | ||
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| found a problem with an internal | 2. | If the error code persists or cannot be |
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| circuit. | ||
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| cleared, replace the lower control. | |
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3. | “HEATING” and “OPEN” Flashing |
| 1. | Gas supply is turned off – pressure too |
Ignition/flame failure. |
| low. Ensure supply and manifold gas | ||
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| The water heater has reached the |
| pressures are within requirements in the |
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| installation manual. Manifold gas | |
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| maximum number of retries and is |
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| pressure is | |
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| currently locked out for one hour. |
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| off by more than 0.3” W.C. (75 Pa) | |
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| Cycle the power to the water |
| replace the lower control. |
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| heater off and on to reset. | 2. | Low supply voltage – should be 115 – |
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| 125 VAC. |
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| 3. | Ensure flame sensor is making good |
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| contact with the burner flame, ensure |
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| flame is steady. |
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| 4. | Ensure the flame sensor is clean – use |
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| ultra fine steel wool or |
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| to clean the flame sensor. |
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| 5. | Ensure the hot surface ignitor is |
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| positioned to provide consistent ignition. |
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| 6. | Check for any cracks in the ignitor |
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| assembly ceramic insulators – replace |
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| ignitor assembly if damaged. |
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| 7. | Check resistance of the ignitor at room |
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| temperature (77°F – 25°C) at the plug |
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| end. Replace ignitor if the resistance is |
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| not within 1.38 to 2.31 ohms at room |
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| temperature. |
4. | “HEATING”, “OPEN”, and “SHORT” Flashing |
| 1. | Ensure flame sensor is making good |
Weak flame sensor current. |
| contact with the burner flame, ensure | ||
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| flame is steady. |
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| 2. | Ensure the flame sensor is clean – use |
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| ultra fine steel wool or |
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| to clean the flame sensor. |
5. | “ECO” and “OPEN” Flashing |
| 1. | Turn the power off for 10 – 20 seconds |
Water temperature in the tank has |
| then on again to clear this error code. | ||
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| exceeded 185°F (85°C) and has | 2. | Replace the lower control if the error |
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| activated the ECO. | ||
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| code persists. | |
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