Lochinvar 402 - 2072 Service Manual page 41

3
Troubleshooting
Table 3E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface
FAULT
Louver Proving
(Lockout will reset
automatically after
5 minutes or may be
reset immediately once
condition has been
corrected. Press the
RESET button on the
SMART SYSTEM display
to reset.)
Tank Open
APS Open
(Lockout will reset
automatically after 5
minutes or may be
reset immediately once
condition has been
corrected. Press the
RESET button on the
SMART SYSTEM display
to reset.)
APS Closed
(Lockout will reset
automatically after 5
minutes or may be
reset immediately once
condition has been
corrected. Press the
RESET button on the
SMART SYSTEM display
to reset.)
Wrong ID Plug
Copper-fin II/IIE Boiler and Water Heater
(continued)
DESCRIPTION
An optional remote proving switch is not
making.
Sensors equipped with an internal limit (such
as the Lochinvar Squire ® Indirect Tank), the
limit has opened due to temperature (195°F)
or the sensor has become disconnected.
The air pressure switch did not make within
1 minute after the combustion air blower has
been energized.
The SMART SYSTEM control sensed that
the air pressure switch was closed before the
combustion air blower was energized.
Control module ID plug does not match the
Accept Personality Plug parameter.
CORRECTIVE ACTION
• Check function of remote devices.
• Check for loose or
proving switch is not installed.
• Check the tank temperature.
• Repair or replace the sensor wiring if damaged.
• Replace the sensor if necessary.
• Check air filter. Clean or replace as necessary.
• Vent/air intake lengths exceed the maximum allowed
lengths.
• Check for blockage or obstruction in vent/air inlet pipe
or at terminations.
• Verify combustion air blower is operating. Replace if
necessary.
• Check for jumper on air pressure switch.
• Check for an unusually high negative draft in the vent
stack.
• 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.
• Verify that the number on the ID label on the control
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.
control module.
Service Manual
misplaced jumper if
If not, replace the
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