Symptom
Possible Cause
Corrective Action
3. Pilot burning, no
gas to main burner,
valve knob in the
"ON" position,
thermostat and/or
on/off/t'stat switch
in the "ON"
position.
A. Thermostat switch or
wires defective.
A. Check thermostat/wiring for proper connections. Place
jumper wire across terminals at thermostat. If burner comes
on, replace defective thermostat. If not OK, place jumper
across thermostat wires at gas valve. If burner comes on,
tighten connections, or replace faulty wires.
B. Thermopile may not be
generating sufficient voltage.
B. Check thermopile output, using a milli-volt meter. If the
optional on/off kit has not been installed, take the readings
across generator terminals of the gas valve. TPTH and TP).
With the on/off kit, take the readings across TH and Terminal
block (which corresponds to #3 on the switch). Milli-volt
reading should be greater than 325 mV. If not, replace the
pilot assembly. If the meter reading is OK, but the burner does
not come on, replace the gas valve.
C. Plugged burner orifice.
C. Remove and check burner orifice, clean or replace. Note:
do not use any metal cleaning device, as this may damage
the orifice.
4. Pilot and burner
come on, but go
out after some
warm-up.
A. Inconsistent, of
insufficient flame on
thermopile.
A. Adjust pilot flame size and assure that the flame is aimed
directly at the thermopile.
B. Insufficient gas pressure. B. Check line pressure to ensure that the correct inlet
pressure is present for the type of gas being used. If propane
pressure is inconsistent, check for water condensation at the
regulator.
5. Frequent pilot
outage problem.
A. Pilot flame may be too
low or blowing, (high),
causing the pilot safety to
drop out.
A. Clean and/or adjust the pilot flame for maximum
impingement on the thermopile and thermocouple.
6. Glass fogs
A. A normal result of gas
combustion.
A. After the heater has warmed up, the glass should clear.
7. Blue Flames
A. A normal result during the
first 20 minutes.
A. Flames should begin to turn more yellowish after 20
minutes of burning.
B. If the blue color stays; adjust the air shutter for a proper
burn.
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