TROUBLESHOOTING
38
Furnace fails to operate
D
Aux limit switch open (blower
compartment)
Check filters and ductwork for blockage, clean
filters or remove obstruction
Check circulator blower speed and performance,
correct speed or replace blower motor if
necessary
Tighten or correct wiring connection
Furnace fails to operate
F
Aux switch (condensate switch)
open
Check evaporator drain pan, trap, piping
Accessing the furnace’s diagnostic menu provides access to the last six faults detected by the furnace. Faults are stored
most recent to least recent, Any consecutively repeated fault is stored a maximum of three times. Example: A clogged re-
turn air lter causes the furnace limit to trip repeatedly. The control will only store this fault the rst three consecutive times
the fault occurs.
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