Lochinvar 1.5, 1.3 service manual Cont’d, Manual Reset, High Limit

Service Manual

3 Troubleshooting

Table 3E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater 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 35 of this manual for removal and
		cleaning procedures. Replace if necessary.
		• Inspect the burner. Reference page 35 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 water heater is piped properly into the
		heating system. Refer to Section 6 - System Piping
		of the Armor X2 Installation and Operation Manual
Manual Reset		for the proper piping methods for the Armor X2.
High Limit		• Check voltage to water heater pump motor on a call for
(will require a		heat. If voltage is not present, check wiring back to
manual reset once the	The outlet water temperature has exceeded	the pump relay.
condition has been	the setting of the high limit.	• Replace the pump relay if necessary.
corrected. Press the
		• If 120 VAC is present on a call for heat and the water
RESET button on the
display to reset.)		heater pump is not operating, replace the pump.
		• If the high limit has tripped, check setting of the
		device.
		• Check resistance of water sensors and compare to
		Table 3B on page 40 of this manual. Replace sensor
		if necessary.
		• Replace high limit.

44