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112301-01D16
TROUBLESHOOTING
MILLIVOLT SYSTEM
Note: Before troubleshooting the system, make sure the gas shutoff valve is ON.
The two most common causes of a malfunctioning gas appliance are:
1. Loose wiring connections
2. Construction debris clogging the pilot and/or gas control valve lter
OBSERVED PROBLEM
Pilot will not light
Pilot will not stay lit
No gas to burner, although wall
switch and valve are set to the
ON position
Frequent pilot outage
Pilot goes out when wall switch
is ON
Spark ignitor will not light pilot
after repeated triggering of red
button
POSSIBLE CAUSE
1. No gas supply or shutoff
valve is OFF
2. Air in gas line
3. Construction debris clog-
ging pilot orice
4. Low gas pressure
5. Control valve knob is not on
the PILOT position
6. Kinked pilot line
7. Bad control valve
1. Loose wiring on thermopile to
regulator. No millivolt current
being sent back to regulator
2. If valve knob and wall switch
are in the ON position, prob-
able defective control valve
1. Wall switch wires defective
2. Thermopile or sensor not
generating sufcient voltage
1. Pilot flame may be too
low, causing safety pilot to
“drop out”
1. Millivolt output on thermo-
pile too high
1. Defective ignitor (no spark at
electrode)
2. Defective pilot or misaligned
electrode at pilot (spark at
electrode)
3. Low line pressure
4. No propane/LP gas in tank
(Propane/LP units only)
REMEDY
1. Check to see if you have gas
supply
2. Hold regulator control valve in
PILOT position for 2-3 minutes
to purge air. If you smell gas
stop and wait a few minutes
before trying to light replace
3. Remove debris and dirt, in-
spect and clean any other
possible obstructions
4. Contact your gas supplier
5. Turn control knob to pilot
6. Have a qualied technician
replace pilot line
7. Have a qualified technician
replace valve
1. Check wiring connections (see
Wiring Diagrams, page 15)
2. Have a qualified technician
replace valve
1. Check electrical connections
and wires for continuity
2. See Pilot will not stay lit,
above
1. Clean and adjust pilot ame
for maximum ame impinge-
ment on thermopile
1. Have a qualified technician
replace thermopile
1. Check for spark at electrode
and pilot. If no spark and
electrode wire is properly
connected, replace ignitor
2. Check gap at electrode and
pilot. Gap should be 1/8" for
strong spark. If gap is correct
but no spark, replace pilot
3. Contact your local NG or LP
gas supplier
4. Rell supply tank (propane/LP
only)