25
PROBLEM
POSSIBLE CAUSES
CORRECTIVE ACTION
The power light does not
The furnace is not connected
Check furnace connection to
illuminate.
to power supply.
power source.
ON and OFF power switch
Replace power switch.
defective.
Fan does not operate
The furnace is not connected to
Check furnace connection
the power supply.
to power source.
Blown fuses.
Replace fuses.
The furnace does not heat.
No power.
Check power source and
fuses or breakers.
Thermocouple is open or
Replace thermocouple or check
thermocouple leads reversed.
thermocouple connections.
Controller malfunction.
Verify and correct all parameters
and configuration values.
If malfunction persists,
replace control.
Element burned out.
Replace muffle (element).
Solid state relay defective.
Replace solid state relay.
Door switch malfunction.
Re-align or replace door switch.
Slow heatup.
Low line voltage.
Install line of sufficient size and
proper voltage. (Isolate furnace
from other electrical loads.)
Heavy load in chamber.
Lighten load in chamber to allow
heat to circulate.
Wrong heating element.
Install proper element.
Wired improperly.
Check wiring diagram for correct
wiring of your furnace.
PROBLEM
POSSIBLE CAUSES
CORRECTIVE ACTION
One side of element is burned out
Replace muffle (element).
on 120V or 100V unit.
Troubleshooting