Lochinvar 1.3 Troubleshooting, Fault, Description, Corrective Action, Service Manual

Service Manual

3 Troubleshooting

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
		will display the Gas Valve / Connection fault.
		• If 24 VAC is present, check the outlet of the valve to
Burner Did Not		ensure the valve is flowing gas. With a manometer
		connected to the outlet tap of the gas valve, when the
Light (cont’d)
	The unit has failed to prove main burner	unit is in the prepurge period, there should be a
(will require a manual
		negative pressure present. When the valve is
reset once the condition	ignition after one attempt. It will require a
		energized a change in pressure should occur. If the
has been corrected.	manual reset before attempting to fire again.
		pressure change does not occur, the gas valve is not
Press the RESET button
		opening. Replace the gas valve.
on the 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.
		• Inspect spark electrode and associated wiring for
		damage and connection. Reference page 39 of this
		manual for removal and cleaning procedures.
		Replace if necessary.
		• Check for proper electrical grounding of unit.
		• Check incoming supply gas pressure. Natural gas
		pressures should be between 4 -			14	inches		w.c.
Flame Lost		(1.0	- 3.5	kPa) and LP gas pressures			should be
		between 8		- 14 inches w.c.	(2.0	-	3.2	kPa).
While Running
	The unit was running and lost the flame	Refer to Section 6 - Gas Connections of the SYNC
(will require a manual
		Installation and Operation Manual for detailed
reset once the condition	signal. This condition occurred twice .
		information concerning the gas supply.
has been corrected.
Press the RESET button		• Verify that the plastic hose from the gas valve to the air
on the display to reset.)
		inlet is connected and is not damaged.
		• Verify that the vent/air intake pipes are installed
		correctly and there are no obstructions.
		• Check for 24 VAC to the gas valve at the 2-pin
		connection on the side of the main control board
		during the ignition attempt. If no voltage is present,
		replace the main control board.

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