Lochinvar 502 - 2072, 402 - 2072 service manual Parameters, Progr, Service Blk, Low Voltage

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

3 Troubleshooting (continued)

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

FAULT	DESCRIPTION	CORRECTIVE ACTION
	After downloading parameters from a laptop,	• Press the ENTER/RESET button on the Smart
Parameters	the main control board must be reset.	System display panel.
Progr
(Will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
	While the unit is in Service Mode, the outlet	• Establish a heating load to remove heat from the
	temperature has exceeded 185°F (85°C).	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
		the Installation and Operation Manual for the proper
Service Blk		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.
	120 VAC input to the main control board has	• Check 120 VAC supply to the transformer.
	dropped below 100 VAC.	• Check wiring connections at the low voltage terminal
		strip.
Low Voltage		• Check the wire size/length to remote devices.
		• Replace the main control board.

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