Trouble Shooting - COZY HEDV403 Installation And Operating Instructions Manual

SYMPTOM
Flame too large
Yellow burner flame
Gas odor
Delayed Ignition
Failure to ignite
Burner won't
turn off
Incorrect gas
input
Not enough heat
Too much heat
Main burner
goes out
during normal
operation
TROUBLE SHOOTING CHART
POSSIBLE CAUSES
1. Defective operator section of valve.
2. Burner orifice too large.
3. If installed above 2,000 ft.
1. Clogged burner ports.
2. Obstruction around vent cap.
1. Gas leak.
1. Low gas pressure.
2. Igniter not peroperly located.
1. Main gas off.
2. Temperature dial or 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. Defective or damaged thermostat wire,
or thermostat.
2. Thermostat sensor location on back of heater.
3. Defective or sticking valve.
4. Excessive gas pressure.
5. Defective or damaged sensor.
1. Gas input not checked.
2. Clogged orifices.
1. Furnace undersized.
2. Temperature dial set too low.
3. Incorrect supply pressure.
1. Temperature dial set too high.
2. Combination control valve stuck open.
1. Defective flame sensor.
2. Input too high.
3. Cover around pilot lighter hole not air
tight.
4. Vent tubes not properly installed or
sealed.
5. Limit switch opens.
6. Exhaust or Air Intake tubes blocked.
CORRECTIVE ACTION
1. Replace valve.
2. Check with local gas company for proper
3. See burner orifice section, Page 11.
1. Remove burners and check for obstruc-
2. Make sure area around vent cap is clear, be
1. See Page 1.
1. Check gas supply pressure.
2. Check ignitor location and correct if
1. Open all manual gas valves.
2. Set temperature dial or thermostat to
3. Clean burner orifices (do not enlarge).
4. Check wiring diagram.
5. Replace valve.
6. Plug in power supply cord. Check 115 V.
1. Can be checked by removing wire from con-
2.Thermostat sensor attached to back of heater
to 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,
1. This is especially true when a dwelling or
2. Raise 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 wing nuts securing cover and sight
4. Follow instructions. Check both exhaust and
5. Clean air filter.
6. Remove obstruction. Check for snow
Page 17
orifice - size and replace.
tions in throats, ports, and orifices. Clean -
but do not enlarge ports or orifices.
sure vent system is sealed.
necessary.
higher temperature.
wall outlet.
trol board terminal. If burner goes off, replace
thermostat.
do not enlarge.
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.
glass. Check and replace gasket if needed.
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.
accumulation around vent cap.