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F35628 (10-04)
TROUBLESHOOTING GUIDE
REMEDY
Check operation of pilot valve
Purge gas lines
Check that gas supply is on
Check and repair wire connection
Check for obstruction or wrong size
orifice
Realign pilot and igniter
Check and repair wire connection
Correct air flow
Check for obstruction or wrong size
orifice
Realign pilot and igniter
Check operation of flame switch
Adjust thermostat to a high
temperature setting
Replace sensor
Check or replace controller
Check thermostat gas valve
Check and repair wire connection
Check or replace thermostat gas
valve
Check or replace temperature
controller
Check and adjust proper gas
pressure
Replace faulty thermostat and sensor
CAUSE
Problem with pilot valve
Gas supply not purged of air
No gas supply
Loose wire connection
Obstructed or wrong size pilot orifice
Problem with alignment of pilot and
igniter
Loose wire connection
Air blowing pilot out
Obstructed or wrong size pilot orifice
Problem with alignment of pilot and
flame switch
Problem with flame switch
Thermostat setting too low
Problem with thermostat sensor
Problem with temperature controller
Problem with thermostat gas valve
Loose wire connection
Problem with thermostat gas valve
Problem with temperature controller
Low gas pressure
Faulty thermostat sensor
SYMPTOM
Pilot does not light after
igniter has been on
several minutes
Pilot fails to remain lit
after igniter goes out
(Pilot may cycle on and
off normally several times
after cold start-up before
the pilot heats up.)
Burner does not come on
(burner light does not
come on)
Heat does not turn off,
burner light is off,
temperature is above
thermostat setting
Heat does not turn off,
burner light is on,
temperature is above
thermostat setting
Temperature varies