Lochinvar 151 - 801 Flame Sequence, Auto Reset, High Limit, Manual Reset, Fault, Description

Service Manual

3Troubleshooting (continued)

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

FAULT	DESCRIPTION	CORRECTIVE ACTION
Flame Sequence		• Check supply voltage for proper polarity.
(will require a manual		• Check external wiring for voltage feedback.
reset once the condition
	The flame detector circuit is seeing a flame
has been corrected. Press		• Check the flame rod and make sure it is clean.
the RESET button on the	signal while no flame is present.	• Check the internal wiring for bad connections.
SMART SYSTEM display
to reset.)		• Replace 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 - Hydronic Piping
		of the Armor Installation and Operation Manual
		for the proper piping methods for the Armor water
		heater.
		• Check 120 vac to water heater 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	The outlet water temperature has exceeded	• If 120 vac is present on a call for heat and the water
	the setting of the automatic reset high limit.	heater pump is not operating, replace the pump.
High Limit
		• If the system pump is a variable speed pump, ensure
		that the system flow is not less than the water heater
		flow.
		• If operating on something other than an outlet sensor,
		check temperature setting of the main control board.
		• If the manual reset high limit has tripped, check
		setting of the device.
		• Check resistance of water sensors and compare to
		Table B on page 26 of this manual. Replace
		sensor if necessary.
		• Replace high limit.
		• 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 Water Heater Installation and Operation
Manual Reset		Manual for the proper piping methods for the Armor
		water heater.
High Limit
		• Check 120 VAC to water heater pump motor on a call
(will require a manual
		for heat. If voltage is not present, check wiring back
reset once the condition	The outlet water temperature has exceeded
		to the main control board.
has been corrected. Press	the fixed setting of the manual reset high
the RESET button on the	limit.	• Replace the main control board if necessary.
SMART SYSTEM display		• If 120 VAC is present on a call for heat and the water
to reset.)		heater pump is not operating, replace the pump.
		• If the manual reset high limit has tripped, check
		setting of the device.
		• Check resistance of water sensors and compare to
		Table 3C on page 26 of this manual. Replace sensor
		if necessary.
		• Replace high limit.
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