Troubleshooting Charts - COZY CDV155D Installation And Operating Instructions Manual

TROUBLESHOOTING CHART ( FOR qUALIFIED SERVICE TECHNICIAN )
SYMPTOM POSSIBLE CAUSES
Flame 1. Defective operator section of valve.
Too Large 2. Burner orifice too large.
3. If installed above 2,000 ft.
1. Clogged burner ports.
Yellow
Burner Flame
2. Obstruction around vent cap.
1. Gas leak.
Gas Odor
1. Pilot flame too small.
Delayed
2. Burner ports clogged at pilot.
Ignition
3. Low gas pressure.
4. Pilot decreases in size when main
burners come on.
1. Main gas off.
Failure
2. Thermostat not set high enough
to Ignite
to call for heat.
3. Clogged burner orifice.
4. Thermostat wired wrong or defective.
5. Defective valve.
Burner 1. Defective or damaged thermostat wire,
Won't Turn or thermostat.
Off 2. Thermostat location.
3. Defective or sticking valve.
4. Excessive gas pressure.
Incorrect 1. Gas input not checked.
2. Clogged orifice.
Gas Input
1. Furnace undersized.
Not Enough
Heat
2. Thermostat set too low.
3. Incorrect supply pressure.
1. Thermostat set too high.
Too Much
Heat 2. Combination control valve stuck open.
1. Weak powerpile or thermocouple.
Pilot and
2. Input too high.
Main Burner
3. Cover around pilot lighter hole not air tight.
Go Out During
Normal
4. Vent tubes not properly installed
Operation
or sealed.
5. Incorrect vent tubes.
CORRECTIVE ACTION
1. Replace valve.
2. Check with local gas company for proper orifice size and replace.
3. See burner orifice section, Page 13.
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. 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. 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. Re-check gas input.
2. Clean orifice 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 temperature setting.
3. Check supply pressure.
1. Lower temperature setting.
2. Replace combination control 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.
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