Lochinvar 150 - 800 3Troubleshooting continued, Fault, Description, Corrective Action, Fan High

Service Manual

3Troubleshooting (continued)

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

FAULT	DESCRIPTION	CORRECTIVE ACTION
	The actual fan RPM is 30% higher than what	• Vent/air intake lengths exceed the maximum allowed
Fan High	is being called for.	lengths. Refer to Section 3 - General Venting of the
		Armor Water Heater Installation and Operation
OR		Manual for proper lengths.
Fan Speed High		• Check for obstruction or blockage in the vent/air
(will require a manual
		intake pipes or at terminations.
reset once the condition
has been corrected. Press		• Check the wiring connections at the fan and at the
the RESET button on the		main control board.
SMART SYSTEM display
to reset.)		• Replace the fan.
		• Replace the main control board.
Sensor Open	Either the inlet water or outlet water	• Check the sensors and their associated wiring.
(will require a manual	temperature sensor has been disconnected.	Repair or replace the sensor or wiring if damaged.
reset once the condition		• Measure the resistance of the sensors and compare
has been corrected. Press
		the resistance to the tables	on page 23 of this
the RESET button on the
		manual.
SMART SYSTEM display
to reset.)		• Replace the sensor if necessary.
Sensor Shorted	Either the inlet water or outlet water	• Check the sensors and their associated wiring.
(will require a manual	temperature sensor has been shorted.	Repair or replace the sensor or wiring if damaged.
reset once the condition
has been corrected. Press		• Measure the resistance of the sensors and compare
the RESET button on the		the resistance to the tables on page 23 of this
SMART SYSTEM display		manual.
to reset.)		• Replace the sensor if necessary.
Aux. Proving	An optional remote proving switch is not	• Check function of remote devices.
(will require a manual	making.	• Check for loose or misplaced jumper if auxiliary
reset once the condition
has been corrected. Press		proving switch is not installed.
the RESET button on the
SMART SYSTEM display
to reset.)
	The flue temperature has exceeded the set	• Inspect the heat exchanger.	Reference page 20 of
	parameters for the water heater.	this manual for the procedure on how to clean the flue
		side of the heat exchanger.
		• Inspect the flue sensor and associated wiring.
		Measure the resistance of the flue sensor and
		compare to Table 3C on page 23 of this manual.
Temp O/Shoot		Replace the sensor if necessary.
		• Verify that the vent/air intake pipes are properly
		installed and that there are no obstructions.
		• Replace the main control board.
	Scaling has reduced water flow.	• Deliming may be required.
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