Service Manual
3 Troubleshooting
Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT | DESCRIPTION | CORRECTIVE ACTION |
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Too Many | Too many manual resets have occurred | • Wait 15 minutes and try again. |
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• Turn power off to unit, wait 30 seconds and then turn | |||||||
Resets - Try Later | during a 15 minute period. | ||||||
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| power back on. |
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Internal Fault | The main control board has detected an | • Replace the main control board. |
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internal fault. |
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Writing to | The main control board has detected an | • Replace the main control board. |
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Memos | internal fault. |
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| • Inspect the heat exchanger. Reference page 35 of | |||||
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| this manual for the procedure on how to clean the | |||||
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| flue side of the heat exchanger. |
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Flue Temp |
| • Inspect the flue sensor and associated wiring. | |||||
The stack temperature has exceeded the | Measure | the resistance of | the flue | sensor and | |||
Shutdown | compare to Table 3E on page 38 of this manual. | ||||||
set parameters for the boiler. | |||||||
| Replace the sensor if necessary. |
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| • Verify that the vent/air intake pipes are properly | |||||
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| installed and that there are no obstructions. |
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| • Replace the main control board. |
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| • Verify that the system is full of water and that all air | |||||
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| has been properly purged from the system. |
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| • Verify that the boiler is piped properly into the heating | |||||
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| system. Refer to Section 5 - Hydronic Piping of the | |||||
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| Crest | Installation and | Operation | Manual | ||
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| for the proper piping methods for the Crest boiler. | |||||
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| • Check for voltage to the boiler pump motor on a call | |||||
Delta T | The temperature rise across the heat | for heat. If voltage is not present, check the wiring | |||||
back to the pump relay. Replace the pump relay if | |||||||
Shutdown | exchanger has exceeded the set parameters | ||||||
necessary. |
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| for the boiler. |
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| • If 120 VAC is present on a call for heat and the boiler | ||||||
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| pump is not operating, replace the pump. |
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| • Verify that the boiler pump is set to the proper speed | |||||
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| or that the pump is the proper size. Reference | |||||
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| Section 5 - Hydronic Piping of the Crest | |||||
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| Installation and Operation | Manual | for | boiler | ||
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| pump specifications. |
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