Epu Defective; Thermopile Defective - Travis Industries Spirit 300 GS Service Manual

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EPU Defective

If the thermocouple production is adequate (see "Thermocouple Defective"), yet the pilot does not
stay lit when the knob is released, the EPU inside the gas control valve is malfunctioning.
Remedy
Replace the gas control valve.
Thermopile
To check millivolt production form the thermopile, connect the multimeter to the center and lower
posts on the gas control valve. Millivolt production is factory set at approximately 400 millivolts
(with the burner off).
Make sure the pilot flame contacts the thermopile 3/8" (for 30 seconds) while testing millivolt
production. If it does not, see "Pilot Flame Needs Adjustment". If you can not adjust the pilot to
achieve 200 millivolts, your thermopile may require replacement.
NOTE: If the main burner is turned on, the millivolt production will appear to drop because the
head coil (the valve that operates the main burner) will draw electricity.
NOTE: If the heater operates for 1 to 5 minutes, then shuts off, it may be a defective thermopile.
Millivolt production is based upon the difference in temperature between the top and
bottom of the thermopile. A defective thermopile may create sufficient millivolts to keep
the main burner operating for the first minutes of operation. But once the stove warms,
the temperature differential lessens and millivolt production goes down.
NOTE: When using a thermostat or remote control, the millivolt production may need to be
increased in certain cases (see page 2-3 for pilot adjustment). The thermostat or remote
wire creates electrical resistance in the main burner circuit, making larger millivolt
production necessary to offset the resistance.
Remedy
Replace the thermopile (or pilot assembly).
Travis Industries
Troubleshooting Steps
Defective
PILOT ADJ
Gas Control Valve
Gas T-Shoot Guide
NOTE: leave the
knob on "PILOT"
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