Lochinvar 50-210 Troubleshooting continued, Fault, Description, Corrective Action, Service Manual

Service Manual

3Troubleshooting (continued)

Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT	DESCRIPTION	CORRECTIVE ACTION
	While the unit is in Service Mode, the outlet	• Establish a heating load to remove the heat from the
	temperature has exceeded 185°F.	boiler loop.
		• Verify that the system is full of water and that all air
		has been properly purged from the system.
		• Verify that the boiler is piped properly into the heating
		system. Refer to Section 6 - Hydronic Piping of the
		Knight Wall Mount Installation and Operation
		Manual for the proper piping methods for the Knight
Service Blk		wall mount boiler.
		• Check 120 vac to the boiler pump motor on a call for
		heat. If voltage is not present, check the wiring back
		to the main control board. Replace the main control
		board if necessary.
		• If 120 vac is present on a call for heat and the boiler
		pump is not operating, replace the pump.
		• Verify that the boiler pump is set to the proper speed
		or that the boiler pump is the proper size. Reference
		Section 6 - Hydronic Piping of the Knight
		Boiler Installation and Operation Manual for boiler
		pump specifications.
	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.
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