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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.
Wired improperly. Check wiring diagram for
correct wiring of your furnace.
One side of element is burned out Replace muffle (element).
on 120V or 100V unit.
Troubleshooting
The Troubleshooting section is intended to aid in defining and correcting possible service problems. When
using the chart, select the problem category that resembles the malfunction; then proceed to the possible
causes category and take necessary corrective action.
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