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