Lochinvar 2072 Troubleshooting, Fault, Description, Corrective Action, Manual Reset, High Limit

Copper-fin II/IIE Boiler and Water Heater Service Manual

3 Troubleshooting

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

FAULT	DESCRIPTION		CORRECTIVE ACTION
	The outlet water temperature has exceeded	• Verify setting of adjustable high limit.
	the setting of the adjustable high limit.	• Verify that the system is full of water and that all air
		has been properly purged from the system.
		• Verify that the appliance is piped properly into the
		system. Refer to the Water Connections Section of
Manual Reset		the	Installation	and	Operation Manual	for
		proper piping methods for the Copper-fin.
High Limit
		• Check 120 VAC to the pump motor on a call for heat.
(Will require a manual
reset once condition has		If voltage is not present, check wiring leading to the
		main control board. Replace the main control board if
been corrected. Press
		necessary.
the RESET button on
the SMART SYSTEM		• If 120 VAC is present on a call for heat and the pump
display to reset.)		is not operating, replace the pump.
		• If the system pump is a variable speed pump, ensure
		the system flow is not less than the boiler flow.
		• Check temperature setting of the main control board.
		• Check resistance of water sensors and compare to
		the tables on page 35 of this manual. Replace the
		sensor if necessary.
		• Replace outlet sensor or high limit.
	The inlet water temperature did not exceed	• Raise temperature setpoint above 130°.
	130° within 15 minutes of ignition.	• Install a 3-way valve or LTV valve per the piping
Inlet Low
		diagram in the Water Connections Section of the
		Installation and Operation Manual.
		• Replace the inlet sensor.
		• Replace the main control board.
Sensor Open		• Check the sensors and			their associated wiring.
		Repair or replace the sensor or wiring if damaged.
(Will require a manual
	Either the inlet water, outlet water, system
reset once the condition		• Measure the resistance of the sensors and compare
has been corrected. Press	supply, system return, or outdoor temperature
the RESET button on the	sensor has been disconnected.	the	resistance to	the tables on page 35 of		this
		manual.
SMART SYSTEM display
to reset.)		• Replace the sensor if necessary.
Sensor Shorted	Either the inlet water, outlet water, system	• Check the sensors and their associated wiring.
(Will require a manual	supply, system return, or outdoor temperature	Repair or replace the sensor or wiring if damaged.
reset once the condition	sensor has been shorted.	• Measure the resistance of the sensors and compare
has been corrected. Press
the RESET button on the		the resistance to the tables on page 35 of this
SMART SYSTEM display		manual.
to reset.)		• Replace the sensor if necessary.

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