Lochinvar 402 Troubleshooting continued, Fault, Description, Corrective Action, Louver Proving

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

3 Troubleshooting (continued)

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

FAULT	DESCRIPTION	CORRECTIVE ACTION
Louver Proving
(Lockout will reset
automatically after		• Check function of remote devices.
5 minutes or may be	An optional remote proving switch is not
reset immediately once
condition has been	making.	• Check for loose or misplaced jumper if
corrected. Press the		proving switch is not installed.
RESET button on the
SMART SYSTEM display
to reset.)
	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)
	or the sensor has become disconnected.	• Replace the sensor if necessary.
APS Open		• Check air filter. Clean or replace as necessary.
(Lockout will reset		• Vent/air intake lengths exceed the maximum allowed
automatically after 5
minutes or may be	The air pressure switch did not make within	lengths.
reset immediately once
	1 minute after the combustion air blower has	• Check for blockage or obstruction in vent/air inlet pipe
condition has been
corrected. Press the	been energized.	or at terminations.
RESET button on the		• Verify combustion air blower is operating. Replace if
SMART SYSTEM display
to reset.)		necessary.
APS Closed
(Lockout will reset		• Check for jumper on air pressure switch.
automatically after 5
minutes or may be	The SMART SYSTEM control sensed that	• Check for an unusually high negative draft in the vent
reset immediately once
	the air pressure switch was closed before the
condition has been	combustion air blower was energized.	stack.
corrected. Press the
RESET button on the
SMART SYSTEM display
to reset.)
		• Verify that ID plug is connected properly to connector
		X5 on the control module.
		• Verify that the wiring in the ID plug is not cut or
		damaged and that the wiring connectors are seated
		properly in the plug.
Wrong ID Plug	Control module ID plug does not match the	• Verify that the number on the ID label on the control
	Accept Personality Plug parameter.	panel matches the number in the Accept Personality
		Plug parameter. If not, replace the control module.
		• When replacing control modules, verify that the
		number in the Accept Personality Plug parameter
		matches the number on the ID label (reference page
		24 of this manual). If so, press the ENTER button on
		the SMART SYSTEM display. If not, replace the
		control module.

41