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1. Pressure regulator set too high.
2. Defective Regulator.
3. Burner orifice too large.
1. Burner orifice too small.
1. Noisy pilot
3. Irregular orifice causing whistle or
resonance.
3. Excessive gas input.
1. Clogged main burner ports.
2. Misaligned orifices.
3. Insufficient combustion air.
1. Blocked venting.
2. Insufficient combustion air.
3. Blocked heat exchanger.
4. Air leak into combustion chamber or
draft hood.
1. Shut off gas supply immediately!
2. Blocked heat exchanger.
3. Drafts around heater.
4. Negative Pressure in building.
5. Blocked draft hood.
1. Main burner ports clogged near pilot.
2. Pressure regulator set too low.
3. Pilot decreases in size when main
burners come on.
4. Pilot flame too small.
5. Drafts around heater.
6. Improper venting.
1. Main gas off.
2. Lack of power at unit.
3. Thermostat not calling for heat.
4. Defective limit switch.
5. Improper thermostat or transformer wiring
at gas valve.
6. Defective gas valve.
7. Defective thermostat
8. Defective transformer.
9. Loose wiring.
10. Defective ignition control.
1. Improper venting.
1. Poor thermostat location.
2. Defective thermostat
3. Improper thermostat or transformer wiring
at gas valve.
4. Short circuit.
5. Defective or sticking gas valve.
6. Excessive gas supply pressure.
Table 6 - Tubular Propeller Trouble Shooting Guide
1. Reset manifold pressure. Refer to
“Operation”.
2. Replace regulator section of combination
gas valve or complete valve.
3. Check with local gas supplier for proper
orifice size and replace. Refer to “Operation”.
1. Check with local gas supplier for proper
orifice size and replace. Refer to “Operation”.
1. Reduce pilot gas. Refer to “Operation”.
2. Replace orifice.
3. Reset manifold pressure. Refer to
“Operation”; Replace regulator section of
combination gas valve or complete valve;
Check with local gas supplier for proper
orifice size and replace. Refer to
“Operation”.
1. Clean main burner ports.
2. Replace manifold assembly.
3. Clean combustion air inlet openings in
bottom panel, see “Installation”.
1. Clean flue. Refer to “Installation”.
2. Clean combustion air inlet openings in
bottom panel, see “Installation”.
3. Clean heater.
4. Determine cause and repair accordingly.
1. Inspect all gas piping and repair.
2. Clean heat exchanger/flue.
3. Eliminate drafts. Refer to “Installation”.
4. See “Installation”.
5. Clean flue collector.
1. Clean main burner ports.
2. Reset manifold pressure. Refer to
“Operation”.
3. Supply piping is inadequately sized.
Refer to “Installation”.
4. Clean pilot orifice. Refer to “Operation”.
5. Eliminate drafts. Refer to “Installation”.
6. Refer to “Installation”.
1. Open all manual gas valves.
2. Replace fuse or turn on power supply.
3. Turn up thermostat
4. Check limit switch with continuity tester. If
open, replace limit switch.
5. Check wiring per diagrams.
6. Replace gas valve.
7. Check thermostat and replace if defective.
8. Replace, if necessary. Also see W, X & Y
symptoms.
9. Check and tighten all wiring connections per
diagrams.
10. Replace, if necessary. Also see W, X, & y
symptoms.
1. Refer to “Installation and Venting”.
1. Relocate thermostat away from drafts.
2. Replace thermostat.
3. Check wiring per diagrams.
4. Check operation at valve. Look for short
(such as staples piercing thermostat wiring),
and correct.
5. Replace gas valve.
6. Refer to “Operation”.
A. Flame lifting from burner ports.
B. Flame pops back.
C. Noisy flame.
D. Yellow tip flame (some yellow
tipping on propane gas is
permissible).
E. Floating flame.
F. Gas Odor.
G. Delayed ignition.
H. Failure to ignite.
J. Condensation of water vapor.
K. Burner won't turn off.
SYMPTOMS
POSSIBLE CAUSE(S)
CORRECTIVE ACTION
