Lochinvar 1 service manual Troubleshooting

						Service Manual
3 Troubleshooting (continued)
Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT	DESCRIPTION		CORRECTIVE ACTION
		• If 24 VAC is present at the main control board, check
		the wiring between the main control board and the gas
		valve. Replace the wiring if necessary. Do not
		disconnect the wiring from the gas valve and attempt
		to measure voltage at that point. The main control
		board can detect if the gas valve is not connected and
Flame Lost		will display the Gas Valve / Connection fault.
		• If 24 VAC is present, check the outlet of the valve to
While Running
		ensure the valve is flowing gas. With a manometer
(cont’d)	The unit was running and lost the flame
		connected to the outlet tap of the gas valve, when the
(will require a
	signal. This condition occurred twice .	unit is in		the prepurge	period, there		should be		a
manual reset once the
		negative		pressure present.		When	the	valve	is
condition has been
		energized a change in pressure should occur. If the
corrected. Press the
		pressure change does not occur, the gas valve is not
RESET button on the
		opening. Replace the gas valve.
display to reset.)
		• Inspect flame sensor and associated wiring.
		Reference page 39 of this manual for removal and
		cleaning procedures. Replace if necessary.
		• Inspect the burner. Reference page 39 of this manual
		for removal and cleaning procedures. Replace if
		necessary.
		• Replace the main control board.
		• 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
		SYNC		Installation	and	Operation		Manual
		for the proper piping methods for the SYNC.
		• Check voltage to boiler pump motor on a call for
Manual Reset		heat. If voltage is not present, check wiring back to
		the pump relay.
High Limit		• Replace the pump relay if necessary.
(will require a
		• If 120 VAC is present on a call for heat and the boiler
manual reset once the	The outlet water temperature has exceeded
condition has been	the setting of the high limit.	pump is not operating, replace the pump.
corrected. Press the		• If the system pump is a variable speed pump, ensure
RESET button on the		that the system flow is not less than the boiler flow.
display to reset.)		• If operating on either an inlet or system supply
		sensor, check temperature setting of the main control
		board.
		• If the high limit has tripped, check setting of the
		device.
		• Check resistance of water sensors and compare to
		Table 3B on page 45 of this manual. Replace sensor
		if necessary.
		• Replace high limit.
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