Trouble Shooting Chart - COZY BBT53 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
Excessive noise

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 properly located.
1. Main gas off.
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.
7. Defective pressure switch.
8. Orifice undersized.
1. Defective or damaged thermostat wire,
or thermostat.
2. Thermostat location.
3. Defective or sticking valve.
4. Excessive gas pressure.
5. Defective or damaged thermostat.
1. Gas input not checked.
2. Clogged orifice.
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.
1. Heater not installed plumb.
2. Vent tube over-tightened in draft inducer.
3. Defective draft inducer.
1. Replace valve.
2. Check with local gas company for proper
3. See burner orifice section, Page 12.
1. Remove burners and check for
2. Make sure area around vent cap is clear,
1. See Page 1.
1. Check gas supply pressure.
2. Check ignitor location and correct if necessary.
1. Open all manual gas valves.
2. Set thermostat to higher temperature.
3. Clean burner orifice (do not enlarge).
4. Check wiring diagram.
5. Replace valve.
6. Check power supply.
7. Replace pressure switch.
8. Check orifice size. See burner orifice
1. Cean be checked by removing wire from
2. Re-locate thermostat out of drafts, hot, or
3. Replace valve.
4. Contact utility supplying gas.
5. Replace thermostat.
1. Re-check gas input.
2. Clean orifices with a smooth wood
1. This is especially true when a dwelling
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 screws securing sight glass.
4. Follow instructions. Check both
5. Check rate - remove any obstructions to
circulating air.
6. Remove obstruction. Check for snow.
1. Check wall and floor making sure both are
2. Loosen vent tube slightly. Make sure draft
3. Replace draft inducer.
Page 21
CORRECTIVE ACTION
orifice size and replace.
obstructions in throats, ports, and
orifices. Clean - but do not enlarge ports
or orifices.
be sure vent system is sealed.
chart, Page 13.
control board terminal. If burner goes off,
replace thermostat.
cold spots.
toothpick, do not enlarge.
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,
or add up to two more heaters.
Check and replace gasket if needed.
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. Check wall thickness and
tube lengths.
square. Square heater as required.
inducer returns to square.