Lochinvar 151 - 801 Description, Flow Switch, 3Troubleshooting, Fault, Corrective Action, Open

Service Manual

3Troubleshooting

Table 3F Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface

FAULT	DESCRIPTION				CORRECTIVE ACTION
	Either the manual reset low	gas	pressure	• Reset the pressure switches.
	switch or the manual reset high gas pressure
Gas Pressure SW	switch tripped.			• Measure the supply gas pressure to determine cause
				of failure.		Natural gas pressures should be between
(will require a manual				4 - 14 inches w.c.
reset once the condition				• Refer to Section 7 - Gas Connections of the Armor
has been corrected.
				Water Heater Installation and Operation Manual for
Press the RESET button
				detailed information concerning the gas supply.
on the SMART SYSTEM
display to reset.)				• Correct the supply gas pressure if necessary.
				• Check for a loose or misplaced jumper if pressure
				switches are not installed.
	The flow switch is not making.			• Check water heater pump operation on a call for heat.
Flow Switch				• Check for closed valves or obstructions in the water
				heater piping.
(will require a manual				• Verify	system is full of		water	and all	air has been
reset once condition has
				purged from the system.
been corrected. Press
the RESET button on				• Check for loose or misplaced jumpers if flow switch is
the SMART SYSTEM
				not installed.
display to reset.)
	Blown fuse.			• Replace fuse F2 on the control board, see page 24 of
				this manual.
Blocked Drain SW				• Check condensate tube from unit to floor drain for
				proper installation and obstructions.
(will require a manual				• Inspect condensate trap for blockage. Clean if
reset once condition has	The blocked drain switch	has	detected
				necessary.
been corrected. Press	excessive condensate build	up inside the
the RESET button on
	unit.			• Check	for	loose wiring	connection at		wire	harness
the SMART SYSTEM
				plug.
display to reset.)
				• Bad blocked drain switch. Replace switch.
				• Check the wiring connections to switch. Wires should
				be connected to the common and normally closed
				terminals.
				• Air intake lengths exceed the maximum allowed
				lengths. Refer to Section 3 - General Venting of the
APS				Armor Water Heater Installation and Operation Manual
				for proper lengths.
Open
				• Check	for	obstruction	or	blockage	in	the air
(will require a manual
				intake pipes or at terminations.
reset once the condition	Air pressure switch contacts are open.
				• Check reference hoses connected to the air pressure
has been corrected.
Press the RESET button				switch for blockage or obstruction.
on the SMART SYSTEM				• Inspect the burner. Reference page 22 of this manual
display to reset.)				for removal and cleaning procedures.					Replace if
				necessary.
				• Inspect the heat exchanger. Reference page 23 of this
				manual for removal and cleaning procedures.
				Replace if necessary.
				• Faulty air pressure switch. Replace switch.

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