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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 & TH. Millivolt meter
should read greater then 460 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
(460 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
1. Flame impingement on logs
1. Adjust the log set to avoid direct flame
impingement. Follow log placement
instructions
IV. Soot deposits on glass
2. Improper primary air setting
2. Open aeration shutter more.
3. Foreign material impeding
burner
3. Ensure that no foreign material blocks
burner flame ports
4. Air inlet blocked or restricted
4. Clean air inlets
5. Vent system is restricted or
inadequate
5. Check correct termination is used.
V
.
Flame burns blue and lifts
off burner
1. Insufficient combustion air being
supplied
2. Manifold pressure set too high
3. Vent system restricted
1.Ensure that no foreign material blocks air
inlets and that the burner shutter is
correctly adjusted. Ensure the vent is
adequate
2. Check manifold pressure
3. Check vent system
VI. 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
