Sterling QVSD - Manual (Page 24)

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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 burner ports.
3. Misaligned
orifi ces.
4. Clogged draft hood.
5. Air
shutter.
6. Insuffi cient combustion air.
1. Blocked Venting.
2. Insuffi cient combustion air.
3. Blocked heat exchanger
4. Air leak into combustion chamber
or draft hood.
1. Shut off gas immediately.
2. Blocked heat exchanger/venting.
3. Drafts around heater.
4. Negative pressure in building.
5. Blocked draft hood.
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 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 shutter. Refer to
“Operation”.
2. Clean main burner ports.
3. Replace manifold assembly.
4. Clean draft hood.
5. Check for dust or lint at air mixer
opening and around air shutter.
6. Check for obstruction in
combustion air inlet cap
and piping. See “Installation”.
1. Clean fl ue. Refer to “Installation”.
2. Check for obstruction in
combustion air inlet cap
and piping. See “Installation”.
3. Clean heater.
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 draft hood.
Table 9 - Troubleshooting Guide
SYMPTOMS POSSIBLE CAUSE(S) CORRECTIVE ACTION
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.