Lochinvar 402, 2072 Troubleshooting continued, Fault, Description, Corrective Action, Service Blk

Copper-fin II/IIE Boiler and Water Heater Service Manual

3 Troubleshooting (continued)

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

FAULT		DESCRIPTION						CORRECTIVE ACTION
							• Establish a heating load to remove heat from			the
								system.
							• Verify that the system is full of water and that all air
								has been properly purged from the system.
							• Verify that the appliance is piped properly		into	the
								system. Refer to the Water Connections Section of
Service Blk	While the unit is in Service Mode, the outlet							the Installation and Operation Manual for the proper
	temperature has exceeded 185°F (85°C).							piping methods.
							• Check 120 VAC to the pump motor on a		call	for
								heat. If voltage is not present, check the wiring
								leading to the main control board. Replace the main
								control board if necessary.
							• If 120 VAC is present on a call for heat		and	the
								pump is not operating, replace the pump.
							• Check 120 VAC supply to the transformer.
							• Check wiring connections at the low voltage terminal
Low Voltage	120 VAC input to the main control board has							strip.
	dropped below 100 VAC.
							• Check the wire size/length to remote devices.
							• Replace the main control board.
Watch Dog Error	The	main control	board	has	detected	an	•	Cycle main power.
	internal fault.						• Replace the main control board.
Write EEProm	The	main control	board	has	detected	an	•	Cycle main power.
	internal fault.						• Replace the main control board.
Program EEProm	The	main control	board	has	detected	an	•	Cycle main power.
	internal fault.						• Replace the main control board.
CRC Parameters							•	Cycle main power.
	The	main control board has detected an					• Replace the main control board.
	internal fault.
							• Restore default parameters using the PC program.
							•	Press RESET.
No Error Stored	The	main control board has detected an					•	Cycle main power.
	internal fault.
							• Replace the main control board.

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