Service Manual
3Troubleshooting (continued)
Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface
FAULT | DESCRIPTION | CORRECTIVE ACTION | |
|
|
| |
| 120 VAC input to the main control board has | • Check 120 VAC supply to the transformer. | |
| dropped below 80 VAC. |
| |
Low 24 VAC |
| • Check wiring connections at the low voltage terminal | |
| strip. | ||
|
| • Check the wire size/length to remote devices. | |
|
| • Replace the transformer. | |
Watch Dog Error | The main control board has detected an | • Replace the main control board. | |
internal fault. |
| ||
|
|
| |
Write EEProm | The main control board has detected an | • Replace the main control board. | |
internal fault. |
| ||
|
|
| |
| The main control board has detected an | • Replace the main control board. | |
CRC Parameters | internal fault. |
| |
|
|
| |
| The main control board has detected an | • Replace the main control board. | |
No Error Stored | internal fault. |
| |
|
|
| |
Fatal Error | The main control board has detected an | • Restore the default parameters. | |
Parameters | internal fault. | • Replace the main control board. | |
• Replace the display board. | |||
|
| ||
|
|
|
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