Troubleshooting Charts - COZY HEDV253A Installation And Operating Instructions Manual

SYMPTOM
Flame 1. Defective operator section of valve.
Too Large
2. Burner orifice too large.
3. If installed above 2,000 ft.
Yellow 1. Clogged burner ports.
Burner Flame
2. Obstruction around vent cap.
Gas Odor 1. Gas leak.
Delayed 1. Low gas pressure.
Ignition
2. Igniter not properly located.
Failure 1. Main gas off.
to Ignite
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.
Burner Won't 1. Defective or damaged
Turn Off thermostat wire or thermostat.
2. Thermostat location.
3. Defective or sticking valve.
4. Excessive gas pressure.
5. Defective or damaged thermostat.
Incorrect 1. Gas input not checked.
Gas Input
2. Clogged orifices.
1. Furnace undersized.
Not
Enough
Heat
2. Thermostat temperature set too low.
3. Incorrect supply pressure.
Too Much 1. Temperature set too high.
Heat
2. Combination control valve stuck open.
Main Burner 1. Defective flame sensor.
Goes Out
2. Input too high.
During
3. Sight glass not air tight.
Normal
4. Vent tubes not properly installed
Operation
or sealed.
5. Limit switch opens.
6. Exhaust or Air Intake tubes blocked.
1017952-A
TROUBLESHOOTING CHART
For use by a qualified service technician.
POSSIBLE CAUSES CORRECTIVE ACTION - (To be performed by Contractor)
1. Replace valve.
2. Check with local gas company for proper orifice - size and replace.
3. See burner orifice section, Page 12.
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.
1. See Page 1.
1. Check gas supply pressure.
2. Check ignitor location and correct if necessary.
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. 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. Re-check gas input.
2. Clean orifices with a smooth wood toothpick, do not enlarge.
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. Lower temperature setting.
2. Replace combination control valve.
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.
Page 20
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