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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.
PROBLEM
The power light does not
illuminate.
Fan does not operate.
The furnace does not heat.
Slow heatup.
Troubleshooting
POSSIBLE CAUSES
The furnace is not connected
to power supply.
ON and OFF power switch
defective.
The furnace is not connected to
the power supply.
Blown fuses.
No power.
Thermocouple is open or
thermocouple leads reversed.
Controller malfunction.
Element burned out.
Solid state relay defective.
Door switch malfunction.
Low line voltage.
Heavy load in chamber.
Wired improperly.
One side of element is burned out
on 120V or 100V unit.
CORRECTIVE ACTION
Check furnace connection to
power source.
Replace power switch.
Check furnace connection
to power source.
Replace fuses.
Check power source and
fuses or breakers.
Replace thermocouple or check
thermocouple connections.
Verify and correct all
parameters and configuration
values. If malfunction persists,
replace control.
Replace muffle (element).
Replace solid state relay.
Re-align or replace door
switch.
Install line of sufficient size and
proper voltage. (Isolate furnace
from other electrical loads.)
Lighten load in chamber to
allow heat to circulate.
Check wiring diagram for
correct wiring of your furnace.
Replace muffle (element).
37
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