Sterling QVSF - Manual (Page 23)

1. Reset manifold pressure. Refer to
“Operation”.
2. Replace regulator section of combin-
ation gas valve or complete valve.
3. Check with local gas supplier for
proper orifi ce size and replace. Refer
to “Operation”.
1. Close air shutter. Refer to “Operation”.
2. Check with local gas supplier for
proper orifi ce size and replace. Refer
to “Operation”.
1. Close air shutter.
2. Reduce pilot gas. Refer to “Operation”.
3. Replace
orifi ce.
4. Reset manifold pressure. Refer to
“Operation”; Replace regulator section
of combination gas valve or complete
valve; or Check with local gas supplier
for proper orifi ce size and replace.
Refer to “Operation”.
1. Open air shutters. Refer to
“Operation”.
2. Clean main burner ports.
3. Replace manifold assembly.
4. Clean fl ue collector.
5. Check for dust or lint at air mixer
opening and around the air shutter.
6. Clean combustion air inlet openings in
bottom panel, see “Installation”.
1. Clean fl ue. Refer to “Installation”.
2. Clean combustion air inlet openings in
bottom panel, see “Installation”.
3. Clean heat exchanger.
4. Determine cause and repair
accordingly.
1. Inspect all gas piping and repair.
2. Clean heat exchanger/fl ue.
3. Eliminate drafts. Refer to “Installation”.
4. See
“Installation”.
5. Clean fl ue collector.
1. Close air shutter. Refer to “Operation".
2. Clean main burner ports.
3. Reset manifold pressure. Refer to
“Operation”.
4. Supply piping is inadequately sized.
Refer to “Installation”.
5. Clean pilot orifi ce. Refer to
“Operation”.
6. Eliminate drafts. Refer to “Installation”.
7. 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.
23
SYMPTOMS POSSIBLE CAUSE(S) CORRECTIVE ACTION
Table 7 - Power Vented Propellers Troubleshooting Guide
1. Pressure regulator set too high.
2. Defective Regulator.
3. Burner orifi ce too large.
1. Excessive primary air.
2. Burner orifi ce too small.
1. Too much primary air.
2. Noisy
pilot.
3. Irregular orifi ce causing whistle or
resonance.
4. Excessive gas input.
1. Insuffi cient primary air.
2. Clogged main burner ports.
3. Misaligned
orifi ces.
4. Clogged fl ue collector.
5. Air shutter linted.
6. Insuffi cient combustion air.
1. Blocked venting.
2. Insuffi cient combustion air.
3. Blocked heat exchanger.
4. Air leak into combustion chamber or
fl ue collector.
1. Shut off gas supply immediately!
2. Blocked heat exchanger/venting.
3. Drafts around heater.
4. Negative Pressure in building.
5. Blocked fl ue collector.
1. Excessive primary air.
2. Main burner ports clogged near pilot.
3. Pressure regulator set too low.
4. Pilot decreases in size when main
burners come on.
5. Pilot fl ame too small.
6. Drafts around heater.
7. 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.
A. Flame lifting from burner
ports.
B. Flame pops back.
C. Noisy fl ame.
D. Yellow tip fl ame (some yellow
tipping on propane gas is
permissible).
E. Floating fl ame.
F. Gas Odor.
G. Delayed ignition.
H. Failure to ignite.