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Page 49 of 64
III. Main burner will not light
A. Valve / Switches
1. Valve control off
1. Turn to “ON” position
2. Blockage at the burner (line,
orifice, or ports)
2. Check and clean
3. Defective wall switch or
thermostat
3. Conduct a continuity test or jumper wire
test and replace if defective
4. Defective wiring or
connections
4. Conduct a test with a jumper wire and
repair as required
5. Excessive length of thermostat
wire from valve to wall switch
or thermostat
5. Reduce wire length to less than 100 feet
or increase wire size
6. Wall switch or thermostat
incorrectly wired
6. Wire correctly
7. Defective Valve
7. Turn valve and “ON/OFF” switch to the
“ON” position. Check with millivolt meter
at terminals TP-TH. Millivolt meter
should read greater then 540 millivolts. If
the reading is OK and the burner does
not come on, replace the gas valve
8. Thermopile may not be
generating sufficient voltage
(750 mV)
8. Recheck using the millivolt meter. The
pilot flame may not be high enough for
the flame to properly engulf the
thermopile. If so, adjust and reset. If
voltage is still insufficient, replace
thermopile
9. Wall switch, thermostat, or
wires are defective
9. Follow previous corrective action, check
switch and wiring. Replace where
defective
IV. Soot deposits on glass
1. Air inlet blocked or restricted
1. Clean air inlets
2. Vent system is restricted or
inadequate
2. Confirm venting & termination are those
which are approved with the appliance
V. Flame burns blue and lifts
off burner
1. Insufficient combustion air
being supplied
1. Ensure that no foreign material blocks air
inlets. Ensure the vent is adequate
2. Manifold pressure set too high
2. Check manifold pressure
3. Vent system restricted
3. Check vent system
VI. Main flame does not burn
properly
1. Incorrect vent or termination
used.
1. Confirm venting & termination are those
which are approved with the appliance
VII. Flames impinge on firebox
top
1. Vent system is restricted or
inadequate
1. Correct flue as required
2. Manifold pressure too high
2. Check manifold pressure as required
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