Lochinvar 2.5, 1.5, 3.5 service manual Troubleshooting, Fault, Description, Corrective Action, Open

Service Manual

3 Troubleshooting

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

FAULT	DESCRIPTION	CORRECTIVE ACTION
Sensor Open		• Check the sensors and their associated wiring.
(will require a manual		Repair or replace the sensor or wiring if damaged.
reset once the condition	Either the inlet water or outlet water	• Measure the resistance of the sensors and compare
has been corrected. Press	temperature sensor has been disconnected.	the resistance to the tables on page	38	of this
the RESET button on the		manual.
display to reset.)
		• Replace the sensor if necessary.
Sensor Shorted		• Check the sensors and their associated		wiring.
		Repair or replace the sensor or wiring if damaged.
(will require a manual
	Either the inlet water or outlet water	• Measure the resistance of the sensors and compare
reset once the condition
has been corrected. Press	temperature sensor has been shorted.	the resistance to the tables on page 38 of this
the RESET button on the		manual.
display to reset.)		• Replace the sensor if necessary.
Flue Sensor		• Check the sensor and its associated wiring. Repair
		or replace the sensor or wiring if damaged.
Open		• Measure the resistance of the sensors and compare
(will require a manual
	The flue sensor has been disconnected or	the resistance to the tables on page 38 of this
reset once the condition
has been corrected. Press	removed from the flue.	manual.
the RESET button on the		• Replace the sensor in flue.
display to reset.)
		• Replace the sensor if necessary.
Flue Sensor		• Check the sensor and its associated wiring.		Repair
Shorted		or replace the sensor or wiring if damaged.
(will require a manual		• Measure the resistance of the sensors and compare
reset once the condition	The flue sensor has been shorted.	the resistance to the tables on page 38 of this
has been corrected. Press
the RESET button on the		manual.
display to reset.)		• Replace the sensor if necessary.
	Sensors equipped with an internal limit (such	• Check the tank temperature.
Tank Open	as the Lochinvar Squire® Indirect Tank), the	• Repair or replace the sensor wiring if damaged.
	limit has opened due to temperature (195°F)	• Replace the sensor if necessary.
	or the sensor has become disconnected.
		• Check the wiring connections to switch. Wires should
		be connected to the common and normally open
		terminals.
		• Remove switch and check for blockage in the orifice.
		• Vent/air intake lengths exceed the maximum allowed
Blower Proving		lengths. Refer to Section 2 - General Venting of the
		Crest Installation and Operation Manual for
Switch Open 1		proper lengths.
(will require a manual	Blower proving pressure switch 1 contacts	• Check for obstruction or blockage in the vent/air
reset once the condition
has been corrected. Press	are open.	intake pipes or at terminations.
		• Inspect the burner. Reference page 34 of this manual
the RESET button on the
		for removal and cleaning procedures.	Replace if
display to reset.)
		necessary.
		• Verify combustion air blower 1 is operating. Replace if
		necessary.
		• Inspect the heat exchanger. Reference page 35 of
		this manual for removal and cleaning procedures.
		• Faulty pressure switch. Replace switch.

48