Lochinvar 400 - 801 Low 24 vac, Watch Dog Error, Write EEProm, CRC Parameters, No Error Stored

Service Manual

3Troubleshooting (continued)

Table 3-4(continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler 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.
		• Check wiring connections at the low voltage
Low 24 vac		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.

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