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 oriifce
- size and replace.
3. If installed above 2,000 ft. 3. See burner orifice section, 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. Obstruction 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 4. Supply piping is too small. Consult local gas
main 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 2. Set thermostat to higher temperature.
to call 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 opens - re-check wires, replace
thermostat.
5. Defective valve. 5. Replace valve.
Burner won’t 1. Defective or damaged thermostat 1. Can be checked by removing wire from valve
turn off wire, or thermostat. terminal. If valve goes off, replace wire or
thermostat.
2. Thermostat location. 2. Follow instructions, check location.
3. Defective or sticking valve. 3. Clean or replace valve.
4. Excessive gas pressure. 4. Contact utility supplying gas.
Incorrect gas 1. Gas input not checked. 1. Re-check gas input.
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 1. Weak powerpile or thermocouple. 1. Check millivoltage and replace if low.
burner go out 2. Input too high. 2. Check input rate.
during normal 3. Cover around pilot lighter hole not 3. Tighten wing nuts securing cover and sight glass.
operation air tight. Check and replace gasket if needed.
4. Vent tubes not properly installed 4. Follow instructions. Check both exhaust and
or sealed. 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. Incorrect vent tubes. 5. Replace with correct tubes.
Page 20
TROUBLE SHOOTING CHART
For use by a qualified installer or service technician.
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