Trouble Shooting
Please check to make sure the instructions are followed exactly before attempting trouble shooting of the
appliance.
Warning:
Trouble shooting and servicing of gas and electrical devices of the appliance should only be
conducted by a qualified service technician.
Caution:
Label all wires prior to disconnection when servicing controls. Wiring errors cause improper
and dangerous operation. Verify proper operation after servicing.
Problem
Pilot will not light after
pressing the sparker
many times.
Pilot will not remain
on after being lit.
Possible Cause
Air in gas line.
No gas supply.
Piezo wire loose
Defective Piezo
Piezo wire grounding
Electrode grounding
Electrode gap incorrect
Poor Pilot flame
Faulty Thermopile
Faulty Thermocouple
Loose TP-THTP wire on
gas valve
Faulty gas valve
Faulty wall or unit
on/off
switch
Corrective Action
Purge air from gas line.
Check to make sure the gas supply to the appliance is
turned on and there is adequate gas supply pressure to
the appliance.
Check for sparks between the spark electrode and the
pilot head when the sparker is pressed. If there are no
sparks:
Check for broken or poor connection from the sparker to
the electrode.
Check for the spark shorting or arcing at other locations.
Check for defective piezo
Check for defective or cracked electrode. With the door
removed, try lighting the pilot with a match.
Note: If there is no gas or air coming out of the pilot and
there is gas pressure to the appliance, the pilot orifice
may be blocked or the gas valve maybe defective.
Check to see if the pilot flame is large enough to reach
and surround the thermocouple. If the flame is too small,
check for correct gas supply pressure. If pressure is
good, adjust the pilot flame size with the adjustment
screw on the valve. If the flame cannot be adjusted,
there might be some debris obstructing the pilot orifice.
Check for correct millivolts at the thermopile. The
thermopile should generate at least 250 mV.
Check for correct millivolts at the thermocouple. The
thermocouple should generate at least 30 mV.
Check for poor connection of the thermocouple and
thermopile to the valve. If readings are correct for the
thermopile and thermocouple, replace gas valve.
Note: This is very rare and faults blamed on the gas
valve are usually incorrect.
Place jumper wire across terminals TP-THTP, if burner
comes on, this will indicate you have a poor connection
or faulty appliance on/off switch, wall switch or wall
thermostat.
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