COZY DVCF403C-H - Troubleshooting Chart (Main Burner); Flame Too Large; Yellow Burner Flame; Gas Odor

1018028-A
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SYMPTOM POSSIBLE CAUSES
TROUBLESHOOTING CHART ( For Qualied Service Technician ) - MAIN BURNER
1. Gas leak.
1. Main gas off.
2. Thermostat not set high enough to
call for heat.
3. Clogged burner orice.
4. Thermostat wired wrong or
defective.
Gas Odor
Failure
to Ignite
CORRECTIVE ACTION
FlameToo
Large
1. Defective operator section of valve.
2. Burner orice too large.
3. If installed above 2,000 feet.
1. Replace valve.
2. Check with local gas company for proper orice size and replace.
3. See orice chart, (Fig.10onpage12).
1. Clogged burner ports.
2. Obstructions around vent cap.
YellowBurner
Flame
1. Remove main burner and check for obstructions in throat, ports, and orices. Clean - but do
not enlarge ports or orices.
2. Make sure area around vent cap is clear, be sure vent system is sealed.
1. Seepage1.
1. Pilot ame too small.
2. Burner ports clogged at pilot.
3. Low gas pressure.
4. Pilot decreases in size when main
burners come on.
Delayed
Ignition
1. Adjust pilot ame.
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 orice (do not enlarge).
4. Check wiring, jump across thermostat terminals at valve, if valve open, re-check wires,
replace thermostat.
1. Defective or damaged
thermostat wire, or thermostat.
2. Thermostat location.
3. Defective or sticking valve.
4. Excessive gas pressure.
BurnerWon’t
TurnOff
1. Can be checked by removing wire from valve terminal. If valve goes off, replace wire
or thermostat.
2. Follow instructions, check location.
3. Replace valve.
4. Contact utility supplying gas.
1. Weak thermocouple.
2. Input too high.
3. Cover around pilot lighter
hole not air tight.
4. Vent tubes not properly
installed or sealed.
Pilot and
Main Burner
go out During
Normal
Operation
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.
1. Gas input not checked.
2. Clogged orice.
1. Thermostat set too high.
2. Combination control valve stuck
open.
Incorrect
GasInput
TooMuch
Heat
1. Re-check gas input.
2. Clean orice with a smooth wood toothpick, do not enlarge.
1. Lower temperature setting.
2. Replace combination control valve.
Pleasefollowthefollowingcorrectiveactionsinorder.
1. Furnace undersized.
2. Thermostat set too low.
3. Incorrect supply pressure.
Not Enough
Heat
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.