1019061-B
Page 15
Flame
Too Large
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
TROUBLESHOOTING CHART
( FOR qUALIFIED SERVICE TECHNICIAN )
1. Defective operator section of valve.
2. Burner orifice too large.
3. If installed above 2,000 ft.
1. Replace valve.
2. Check with local gas company for proper orifice size and replace.
3. See burner orifice section,
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.
1. Clogged burner ports.
2. Obstruction around vent cap.
1. Gas leak.
1. Pilot flame too small.
2. Burner ports clogged at pilot.
3. Low gas pressure.
4. Pilot decreases in size when main
burners come on.
1. Main gas off.
2. Thermostat not set high enough
to call for heat.
3. Clogged burner orifice.
4. Thermostat wired wrong or defective.
5. Defective valve.
1. Weak powerpile or thermocouple.
2. Input too high.
3. Cover around pilot lighter hole not air tight.
4. Vent tubes not properly installed
or sealed.
5. Incorrect vent tubes.
1. Gas input not checked.
2. Clogged orifice.
1. Thermostat set too high.
2. Combination control valve stuck open.
1. Defective or damaged thermostat wire,
or thermostat.
2. Thermostat location.
3. Defective or sticking valve.
4. Excessive gas pressure.
Yellow
Burner Flame
Gas Odor
Delayed
Ignition
Failure
to Ignite
Pilot and
Main Burner
Go Out During
Normal
Operation
Incorrect
Gas Input
Too Much
Heat
Burner
Won’t Turn
Off
1. Remove main burner and check for obstructions in throat, ports, and orifices.
Clean - but do not enlarge ports or orifices.
2. Make sure area around vent cap is clear, be sure vent system is sealed.
1. See
Page 1
.
1. Adjust pilot flame.
2. Clean burner ports (do not enlarge).
3. Check gas supply pressure.
4. Supply piping is too small. Consult local gas company or competent installer.
1. Re-check gas input.
2. Clean orifice with a smooth wood toothpick, do not enlarge.
1. Lower temperature setting.
2. Replace combination control valve.
1. Can be checked by removing wire from valve terminal. If valve goes off,
replace wire or thermostat.
2. Follow instructions, check location.
3. Clean or replace valve.
4. Contact utility supplying gas.
1. Furnace undersized.
2. Thermostat set too low.
3. Incorrect supply pressure.
Not Enough
Heat
1. This is especially true when a dwelling or room is enlarged. Have the heat loss
calculated and compare to furnace output. Your gas company can supply you with
this information. If furnace is undersized, replace with correct size unit.
2. Raise temperature setting.
3. Check supply pressure.
1. Open all manual gas valves.
2. Set thermostat to higher temperature.
3. Clean burner orifice, (do not enlarge).
4. Check wiring, jump across thermostat terminals at valve, if valve opens - re-check
wires, replace thermostat.
5. Replace valve.
1. Check millivoltage and replace if low.
2. Check input rate.
3. Tighten wing nuts securing cover and sight glass. Check and replace gasket if
needed.
4. Follow instructions. Check both exhaust and air intake tubes, and vent cap.
Be sure all gaskets are in place and properly sealed. Use only tubes and vent
cap supplied. Do not alter vent tubes or cap.
5. Replace with correct tubes.
