Lochinvar 81-286 Flue Sensor Fault, Flue Temp Diff, Flue Temp Limit, Fatal Error, Memory Error

Service Manual

3 Troubleshooting (continued)

Table 3-4(continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT	DESCRIPTION			CORRECTIVE ACTION
		• Check		wiring to sensor. Make sure wiring is
Flue Sensor Fault			connected and not damaged.		Reconnect / repair
			wiring if necessary.
(will require a manual reset
	The control reads the flue sensor as open
once the condition has been		• Measure the resistance of the sensor and compare
corrected. Press the RESET	or shorted.		to the resistance in Table 3-2D on page 35 of this
button on the SMART
			manual. Replace the sensor if necessary.
SYSTEM display to reset.)
		•	Replace control module.
		• Check		wiring to sensor. Make sure wiring is
			connected and not damaged. Reconnect / repair
Flue Temp Diff			wiring if necessary.
		• Measure the resistance of the sensor and compare to
(will require a manual reset	The control module reads an excessive
once the condition has been			the resistance in Table 3-2D		on page 35 of this
corrected. Press the RESET	temperature difference between the two		manual. Replace sensor if necessary.
	sensors.
button on the SMART		•	Restore control parameter defaults from optional PC
SYSTEM display to reset.)
			software.
		•	Replace control module.
		• Inspect the heat exchanger. Reference page 32 of
			this manual for the procedure on how to clean the flue
			side of the heat exchanger.
Flue Temp Limit		• Inspect		the flue sensor and	associated wiring.
(will require a manual reset
	The stack temperature has exceeded the		Measure the resistance of the flue sensor and
once the condition has been
			compare to Table 3-2D on page 35 of this manual.
corrected. Press the RESET Flue Temp Limit set parameters.
			Replace the sensor if necessary.
button on the SMART
SYSTEM display to reset.)		• Verify that the vent/air intake			pipes are properly
			installed and that there are no obstructions.
		• Replace the main control board.

		• Restore the parameter defaults from the optional PC
Fatal Error	The control module has detected parameter	software.
	settings that are out of range.
		• Replace control module.

Memory Error

A lockout occurs at the same time as a power outage.

• Reset control module.

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