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SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
Flame too large 1. Defective operator section of valve. 1. Replace valve.
2. Burner orifice too large. 2. Check with local gas company for proper orifice
size and replace.
3. If installed above 2,000 feet. 3. See orifice chart, page 10.
Yellow burner flame 1. Clogged burner ports. 1. Remove main burner and check for obstructions in
throat, ports, and orifices. Clean - but do not enlarge
ports or orifices.
2. Obstructions around vent cap. 2. Make sure area around vent cap is clear, be sure
vent system is sealed.
Gas Odor 1. Gas leak. 1. See Page 1.
Delayed Ignition 1. Pilot flame too small. 1. Adjust pilot flame.
2. Burner ports clogged at pilot. 2. Clean burner ports (do not enlarge).
3. Low gas pressure. 3. Check gas supply pressure.
4. Pilot decreases in size when main 4. Supply piping is too small. Consult local gas
burners come on. company or competent installer.
Failure to ignite 1. Main gas off. 1. Open all manual gas valves.
2. Thermostat not set high enough to call 2. Set thermostat to higher temperature.
for heat.
3. Clogged burner orifice. 3. Clean burner orifice (do not enlarge).
4. Thermostat wired wrong or defective. 4. Check wiring, jump across thermostat terminals at
valve, if valve open, re-check wires, replace thermostat.
Burner won’t turn off 1. Defective or damaged thermostat wire, 1. Can be checked by removing wire from valve terminal.
or thermostat. If valve goes off, replace wire or thermostat.
2. Thermostat location. 2. Follow instructions, check location.
3. Defective or sticking valve. 3. Replace valve.
4. Excessive gas pressure. 4. Contact utility supplying gas.
Incorrect gas input 1. Gas input not checked. 1. Re-check gas input.
2. Clogged orifice. 2. Clean orifice with a smooth wood toothpick,
do not enlarge.
Not enough heat 1. Furnace undersized. 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. Thermostat set too low. 2. Raise temperature setting.
3. Incorrect supply pressure. 3. Check supply pressure.
Too much heat 1. Thermostat set too high. 1. Lower temperature setting.
2. Combination control valve stuck open. 2. Replace combination control valve.
Pilot and main burner 1. Weak thermocouple. 1. Check millivoltage and replace if low.
go out during normal 2. Input too high. 2. Check input rate.
operation 3. Cover around pilot lighter hole not 3. Tighten wing nuts securing cover and sight glass.
air tight. Check and replace gasket if needed.
4. Vent tubes not properly installed or 4. Follow instructions. Check both exhaust and air
sealed. 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.
TROUBLE SHOOTING CHART
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