Specifications

PROBLEM PROBABLE CAUSE CORRECTIVE ACTION
The power light does not illuminate. The furnace is not connected Check furnace connection
to power supply. to power source.
ON and OFF power switch is Replace power switch.
defective.
Fuses blown. Replace fuses.
The furnace does not heat,
cycle light illuminated. Heating elements burned out or Replace heating elements or
improper connections. repair connections.
The furnace does not heat, No power. Check power source and fuses or
cycle light not illuminated. breakers.
Two or more heating elements in Replace defective elements.
208V or 240V furnaces are burned
out.
Thermocouple has oxidized and Replace thermocouple.
opened the circuit. Indicated by:
a) basic automatic control - 1-5
degrees on display
b) automatic control - “OR” on
display.
c) Prog. 2 ramp & 2 dwell -
“SNB” on display.
d) Prog. 8 ramp & 8 dwell -
“OR” on display.
Defective electrical hookup. Repair electrical hookup.
Set point set too low. Reset set point to a higher value.
High power limit set to a low level. Reset level to a higher value.
Door switch malfunction. Re-align or replace door safety
switch.
Defective mechanical door switch Replace relay.
relay coil or contacts.
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Troubleshooting