Lochinvar Power-fin 502 Service Manual page 39

3
Troubleshooting
Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface
F F A A U U L L T T
Fan High
OR
Fan Speed High
(Will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
Flue Open
OR
Flue Shorted
(For M9 Models operation
will not be affected. For
B9 Models the unit will
not modulate.)
Sensor Open
(Will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
Sensor Shorted
(Will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
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.)
(continued)
D D E E S S C C R R I I P P T T I I O O N N
The actual fan RPM is 30% higher than what
is being called for.
The flue sensor wiring
disconnected, grounded, or the flue sensor
has been removed from the flue.
Either the inlet water or outlet water
temperature sensor has been disconnected.
Either the inlet water or outlet water
temperature sensor has been shorted.
An optional remote proving switch is not
making.
C C O O R R R R E E C C T T I I V V E E A A C C T T I I O O N N
• Vent/air intake lengths exceed the maximum
allowed lengths. Refer to Section 2 - Venting of the
Power-fin Installation and Operation Manual for
proper lengths.
• Check for obstruction or blockage in the vent/air
intake pipes or at terminations.
• Check wiring connections at the fan and at the
main control board.
• Replace the fan.
• Replace the main control board.
has been • Check the sensor and associated wiring. Repair or
replace sensor or wiring if damaged.
• Reinstall sensor in flue outlet.
• Check the sensors and their associated wiring.
Repair or replace the sensor or wiring if damaged.
• Measure the resistance of the sensors and compare
the resistance to the tables on page 33 of this
manual.
• Replace the sensor if necessary.
• Check the sensors and their associated wiring.
Repair or replace the sensor or wiring if damaged.
• Measure the resistance of the sensors and compare
the resistance to the tables on page 33 of this
manual.
• Replace the sensor if necessary.
• Check function of remote devices.
• Check for
proving switch is not installed.
Service Manual
loose or misplaced jumper if
39