Lochinvar 150 - 800 service manual No Flame, Running

Service Manual

3Troubleshooting (continued)

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

FAULT		DESCRIPTION		CORRECTIVE ACTION
	The unit was running and lost the flame		• Inspect spark electrode and associated wiring for
	signal.	This condition occurred four (4)	damage and connection.			Reference page 19 of this
	straight times.		manual for removal and cleaning procedures. Replace
			if necessary.
	Exception: Models 500 - 800 will lock out		• Check for proper electrical grounding of unit.
	after one retry for ignition. It will require a
	manual reset before attempting to fire again.		• Check	incoming	supply	gas pressure. Natural gas
			pressures should be between 4 -				14 inches	w.c. and
			LP gas pressures should be between 8 - 14 inches w.c.
			Refer to Section 7 - Gas Connections of the Armor
			Water Heater Installation and Operation Manual for
			detailed information concerning the gas supply.
			• Verify that the plastic hose from the gas valve to the air
			inlet is connected and is not damaged.
			• Verify that the vent/air intake pipes are installed
			correctly and there are no obstructions.
No Flame			• Check for 24 VAC to the gas valve at the 2-pin
			connection on the side of the main control board during
Running			the ignition attempt. If no voltage is present, replace the
(will require a manual			main control board.
reset once the condition			• If 24 VAC is present at the main control board, check
has been corrected.
			the wiring between the main control board and the gas
Press the RESET button
			valve.	Replace	the wiring if		necessary.	Do not
on the SMART
			disconnect the wiring from the gas valve and attempt to
SYSTEM display to
			measure voltage at that point. The main control board
reset.)
			can detect if the gas valve is not connected and will
			display the GV / Relay Fail fault.
			• If 24 VAC is present, check the outlet of the valve to
			ensure the valve is flowing gas. With a manometer
			connected to the outlet tap of the gas valve, when the
			unit is in the prepurge period, there should be a
			negative pressure present. When the valve is
			energized a change in pressure should occur. If the
			pressure change does not occur, the gas valve is not
			opening. Replace the gas valve.
			• Inspect	flame	sensor	and	associated	wiring.
			Reference page 19 of this manual for removal and
			cleaning procedures. Replace if necessary.
			• Inspect the burner. Reference page 19 of this manual
			for removal and cleaning procedures. Replace if
			necessary.
			• Replace the main control board.

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