Lochinvar 402 Troubleshooting continued, Fault, Description, Corrective Action, No Flame, Running

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
	The unit was running and lost the flame signal.	• Inspect igniter and associated wiring for damage and
		connection. Reference page 27 of this manual for
		removal and cleaning procedure. Replace if
		necessary.
		• Check for proper electrical grounding of unit.
		• Check incoming supply gas pressure. Refer to the
No Flame		Gas Connections Section of the Installation and
		Operation Manual for detailed information concerning
Running		the gas supply.
(Will require a manual		• Verify that	the	tube from	the gas valve	to	the
reset once the condition
		combustion	air	chamber is	connected and	is	not
has been corrected. Press
		damaged.
the RESET button on the
SMART SYSTEM display		• Verify that the vent/air intake pipes are installed
to reset.)		correctly and there are no obstructions.
		• Refer to the Checking Manifold Gas Pressure and
		Combustion Analysis Procedure on pages 29 and 30
		of this manual for the proper settings.
		• Inspect the burners. Reference pages 28 and 29
		of this manual for removal and cleaning procedures.
		Replace if necessary.
		• Replace the main control board.
	The outlet water temperature has exceeded the	• Verify that the system is full of water and that all air
	setting of the automatic reset high limit.	has been properly purged from the system.
		• Verify that the appliance is piped properly into the
		heating system. Refer to the Water Connections
		Section of the Installation and Operation Manual for
		the proper piping methods for the Copper-fin.
		• Check 120 VAC to boiler pump motor on a call for
		heat. If voltage is not present, check wiring back
		to the main control board. Replace the main
		control board if necessary.
Auto Reset		• If 120 VAC is present on a call for heat and the
High Limit		pump is not operating, replace the pump.
		• If the system pump is a variable speed pump,
		ensure that the system flow is not less than the
		boiler flow.
		• Check temperature setting of the main control
		board.
		• Check resistance of water sensors and compare to
		Table 3B on page 35 of this manual. Replace
		sensor if necessary.
		• Replace outlet sensor.

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