Problem solving
8Problem solving
8.1Error code diagnostics
To remove error code from the
idisplay, press the reset button.
Display | Cause |
| Solution | |
| Fault in the flue gas limiter. | 1. | Check continuity of the flue gas limiter (see Fig. 64, page 49). | |
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| Go to steps two and three to determine air box temperature | |
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| sensor fault and replace it. | |
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| 2. Check for flue gas leakage around the top and bottom seals of | |
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| heat exchanger as well as the viewing window. | |
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| 3. | Check that venting is within specifications (see Section 3.3). |
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| Long vent lengths, venting with more than three elbows, blocked | |
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| vent or combination venting may cause this failure. | |
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| 4. | Check that flue gas limiter connector and spade connections |
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| are secure. | |
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| 5. Unplug heater and check the two main plug connections inside | |
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| the control board. | |
| Appliance selection on “P7” mode | 1. | Check “P7” mode: water heater requires setting “NC”. | |
| is not correct. |
| 2. | Check jumper and connection on sensor at upper right hand |
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| corner of heat exchanger. | |
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| 3. | Measure jumper resistance, must be |
| Backflow temperature sensor | 1. Check backflow temperature sensor connection and resistance. | ||
| defect - happens if sensor is | See Fig. 62, page 47 and Fig. 64, page 49. | ||
| disconnected or short circuit. | 2. | Replace backflow temperature sensor. | |
| Outlet temperature | sensor fault | 1. | Check red wire connections at hot water temperature sensor. |
| (Temperature below | freezing or | Clean terminals with an eraser. If badly corroded, replace sensor | |
| above 210°F). |
| and wire harness. See Fig. 64, page 49. | |
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| 2. | Sensor may trip if water temperature drops below freezing to |
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| protect heater from freezing conditions. Any damage due to | |
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| freezing conditions is not covered under warranty. | |
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| 3. | Clean inlet filter screen and clear any debris out of shower |
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| heads, faucet aerators and whole house filters. | |
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| 4. | In areas where water has a high mineral content, periodic |
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| descaling may be necessary. | |
Table 20 |
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* By installer or service technician only. |
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