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Symptom
3. (Continued)
c. Defective valve
d. Plugged burner
e. Wall switch or wires
4. Frequent pilot
a. Pilot flame may be
outage problem.
Possible Cause
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.
orifice
Remove stoppage.
Follow the corrective action in Symptom
are defective
and Possible Cause 1. a. above. Check
the switch and wiring. Replace where
defective.
Clean and adjust the pilot flame for
too high or too low,
maximum flame impingement on
or blowing (high),
thermocouple. Follow lighting
causing pilot safety
instructions carefully.
to drop out
Corrective Action
39
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