COZY HEDV254A Installation And Operating Instructions Manual page 18

SYMPTOM
Flame too large
Yellow burner flame
Gas odor
Delayed Ignition
Failure to ignite
Burner won't
mm off
1.
2.
3.
l.
TROUBLE SHOOTING CHART
CORRECTIVE ACTION
POSSIBLE CAUSES To be taken by Contractor
Defective operator section of valve. 1. Replace valve.
Burner orifice too large. 2. Check with local gas company for proper
If installed above 2,000 ft.
(?logged burner ports.
2. Obstruction around vent cap.
l. Gas leak.
I. Low gas pressure.
2. Igniter not properly located.
1. Main gas off.
2. Thermostat not set high enough to call
for heat.
3. (?logged burner orifice.
4. Incorrect wiring.
5. Defective valve.
6. No power to unit.
Defective or damaged thermostat wire,
or them_ostat.
2. Thermostat location.
3. Defective or sticking valve.
4. Excessive gas pressure.
5. Defective or damaged thermostat.
Incon'ect gas I. Gas inpm not checked.
input 2. Clogged orifices.
Not enough heat l. Furnace undersized.
Too much heat
2. Thermostat temperature set too low.
3. Incon'ect
supply
pressure.
I. Temperature set too high.
2. Combination control xalve stuck open.
I. Defective flame sensor.
2. Input too high.
3. Sight glass not air tight.
Vent tubes not properly installed or
sealed.
5. Limit switch opens.
6. Exhaust or Air Intake tubes blocked.
orifice - size and replace.
3. See burner orifice section, Page 11.
1. Remove burners and check for obstruc-
tions in throats, ports, and orifices. Clean -
but do not enlarge ports or orifices.
2. Make sure area around vent cap is clear, be
sur_ _'_n_ _ys_¢m is s_!_d,
1. See Page 1.
1. Check gas supply pressure.
2. Check ignitor location and con'ect 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 1 i5 V.
wall outlet.
1. (Jan be checked by removing wire fi'om con-
trol board terminal. If burner goes off, replace
thermostat.
2.Re-locate out of &afis, hot, or cold spots.
3. Replace valve.
4. Contact utility supplying gas.
5. Replace thermostat.
1. Re-check gas input.
2. (?lean 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 con'ect size unit.
2. Raise thermostat temperature setting.
3. Check
snpply
pressure.
1. Lower temperature setting.
2. Replace combination control vah'e.
1. Check voltage and replace if low.
2. Check input rate.
3. Tighten screws securing sight glass. Check
and replace gasket if needed.
4. Follow instrnctions. Check both exhaust and
air intake tubes, and vent cap. Be sure all
gaskets are in place and properly sealed. Use
only robes 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.
Main burner
goes out
duringnormal
operation
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