1017952-A
Page 20
Flame
Too Large
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION -
(To be performed by Contractor)
TROUBLESHOOTING CHART
For use by a 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, Page 12.
1. Gas leak.
1. Low gas pressure.
2. Igniter not properly located.
1. Temperature set too high.
2. Combination control valve stuck open.
1. Main gas off.
2. Thermostat not set
high enough to call for heat.
3. Clogged burner orifice.
4. Incorrect wiring.
5. Defective valve.
6. No power to unit.
1. Furnace undersized.
2. Thermostat temperature set too low.
3. Incorrect supply pressure.
1. Gas input not checked.
2. Clogged orifices.
Gas Odor
Delayed
Ignition
Too Much
Heat
Failure
to Ignite
Not
Enough
Heat
Incorrect
Gas Input
1. See Page 1.
1. Check gas supply pressure.
2. Check ignitor location and correct if necessary.
1. Lower temperature setting.
2. Replace combination control valve.
1. Open manual gas valve.
2. Set thermostat to higher temperature.
3. Clean burner orifices (do not enlarge).
4. Check wiring diagram.
5. Replace valve.
6. Plug in power supply cord. Check 115 V. wall outlet.
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 thermostat temperature setting.
3. Check supply pressure.
1. Re-check gas input.
2. Clean orifices with a smooth wood toothpick, do not enlarge.
1. Defective or damaged
thermostat wire or thermostat.
2. Thermostat location.
3. Defective or sticking valve.
4. Excessive gas pressure.
5. Defective or damaged thermostat.
Burner Won’t
Turn Off
1. Defective flame sensor.
2. Input too high.
3. Sight glass not air tight.
4. Vent tubes not properly installed
or sealed.
5. Limit switch opens.
6. Exhaust or Air Intake tubes blocked.
Main Burner
Goes Out
During
Normal
Operation
1. Check voltage and replace if low.
2. Check input rate.
3. Tighten screws securing sight glass. Check & 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. Check for blockage of discharge air.
6. Check for and remove any obstruction to incoming circulating air.
1. Can be checked by removing wire from control board terminal.
If burner goes off, replace thermostat.
2. Re-locate out of drafts, hot, or cold spots.
3. Replace valve.
4. Contact utility supplying gas.
5. Replace thermostat.
1. Clogged burner ports.
2. Obstruction around vent cap.
Yellow
Burner Flame
1. Remove burners and check for obstructions in throats, 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.