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Symptom
3. (Continued)
4. Frequent pilot
outage problem.
Possible Cause
c. Defective valve
d. Plugged burner
orifice
e. Wall switch or wires
are defective
a. Pilot flame may be
too high or too low,
or blowing (high),
causing pilot safety
to drop out
Corrective Action
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
specified 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.
Turn the valve knob to the ON position.
Place the ON/OFF switch in the ON
position. Check the millivolt meter at
the thermopile terminals. The millivolt
meter should read greater than 125mV
If the reading is acceptable, and if the
burner does not come on, replace the
gas valve.
Check the burner orifice for stoppage.
Remove stoppage.
Follow the corrective action in
Symptom and Possible Cause 1. a.
above. Check the switch and wiring.
Replace where defective.
Clean and adjust the pilot flame for
maximum flame impingement on
thermocouple. Follow lighting
instructions carefully.