Sterling QVEF User Manual download pdf (Page 18)

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.

18

SYMPTOMS

POSSIBLE CAUSE(S) CORRECTIVE ACTION

Table 6 - 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.

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