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35Heat & Glo • SL-550 / 750 / 950TV-D • 2053-985 Rev. J • 4/07
Troubleshooting
14
Symptom Possible Causes Corrective Actions
1. After repeated
triggering of the
red or black piezo
ignitor button, the
spark ignitor will not
light the pilot.
a. Defective ignitor. Check the spark at the electrode and pilot. If no spark and electrode wire
is properly connected, replace the ignitor.
b. Defective pilot
or misaligned
electrode (spark at
electrode).
Using match, light the pilot. If the pilot lights, turn off the pilot and trigger
the red piezo ignitor button again. If the pilot lights, an improper gas/air
mixture caused the bad lighting and a longer purge period is recom-
mended. If the pilot will not light, ensure the gap at the electrode and pilot
is one-eighth (1/8) inch to have a strong spark. If the gap is OK, replace
the pilot.
c. No gas or low
gas pressure.
Check the remote shut-off valves from the fi replace. Usually, there is a
valve near the gas main. There can be more than one (1) valve between
the fi replace and the main.
d. No LP in tank. Check the LP (propane) tank. You may be out of fuel.
2. The pilot will not
stay lit after care-
fully following the
lighting instructions.
a. Defective ther-
mocouple.
Check that the pilot fl ame impinges on the thermocouple. Clean and/or
adjust the pilot for maximum fl ame impingement.
Ensure that the thermocouple connection at the gas valve is fully inserted
and tight (hand tighten plus 1/4 turn).
Disconnect the thermocouple from the valve, place one millivolt meter
lead wire on the tip of the thermocouple and the other meter lead wire on
the thermocouple copper lead. Start the pilot and hold the valve knob in. If
the millivolt reading is less than 15mV, replace the thermocouple.
b. Defective valve. If the thermocouple is producing more than 15 millivolts, replace faulty
valve.
3. The pilot is
burning, there is
no burner fl ame,
the valve knob is
in the ON position,
and the ON/OFF
switch is in the ON
position.
a. ON/OFF switch
or wires defective.
Check the ON/OFF switch and wires for proper connections. Place the
jumper wires across the terminals at the switch. If the burner comes on,
replace the defective switch. If the switch is OK, place the jumper wires
across the switch wires at the gas valve. If the burner comes on, the wires
are faulty or connections are bad.
b. Thermopile may
not be generating
suffi cient millivolt-
age.
If the pilot fl ame is not close enough physically to the thermopile, adjust
the pilot fl ame.
Be sure the wire connections from the thermopile at the gas valve termi-
nals are tight and that the thermopile is fully inserted into the pilot bracket.
Check the thermopile with a millivolt meter. Take the reading at TH-
TP&TP terminals of the gas valve. The meter should read 325 millivolts
minimum, while holding the valve knob depressed in the pilot position,
with the pilot lit, and the ON/OFF switch in the OFF position. Replace the
faulty thermopile if the reading is below the specifi ed minimum.
With the pilot in the ON position, disconnect the thermopile leads from
the valve. Take a reading at the thermopile leads. The reading should be
325 millivolts minimum. Replace the thermopile if the reading is below the
minimum.
With proper installation, operation, and maintenance your gas appliance will provide years of trouble-free service. If you do
experience a problem, this troubleshooting guide will assist a qualifi ed service person in the diagnosis of a problem and the
corrective action to be taken. This troubleshooting guide can only be used by a qualifi ed service technician.
A. Standing Pilot Ignition System