FMI Natural Gas Burner System SDVBND, Owner'S Operation And Installation Manual

Page: 31 / 40

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OBSERVED PROBLEM POSSIBLE CAUSE REMEDY
Pilot lights but flame goes
out when control knob is
released.
1. Control knob not fully
pressed in.
2. Control knob not pressed in
long enough.
3. Equipment shutoff valve not
fully open.
4. Pilot flame not touching
thermocouple, which allows
thermocouple to cool, caus-
ing pilot flame to go out. This
problem could be caused by
one or both of the following:
A) Low gas pressure
B) Dirty or partially clogged
pilot
5. Thermocouple connection
loose at control valve .
6. Thermocouple damaged.
7. Control valve damaged.
1. Press in control knob fully
2. After pilot lights, keep control
knob pressed in 30 seconds
3. Fully open equipment shutoff
valve
4. A) Contact local gas com-
pany.
B) Clean pilot (see
Cleaning
and Maintenance , page 28)
or replace pilot assembly.
5. Hand tighten until snug, then
tighten 1/4 turn more.
6. Replace pilot assembly.
7. Replace control valve.
Burner does not light after
pilot is lit. 1. Burner orifice clogged.
2. Inlet gas pressure is too
low.
3. Thermopile leads discon-
nected or improperly con-
nected.
4. Thermopile is defective.
1. Clean burner (see Cleaning
and Maintenance , page 28)
or replace burner orifice.
2. Contact local propane/LP or
natural gas company.
3. Reconnect leads (see Wiring
Diagram, page 38).
4. Replace thermopile.
Delayed ignition burner. 1. Manifold pressure is too
low.
2. Burner porting or orifice
clogged.
1. Contact local propane/LP or
natural gas company.
2. Clean burner (see Cleaning
and Maintenance , page 28)
or replace burner orifice.
Burner backfiring during
combustion. 1. Burner orifice is clogged or
damaged.
2. Damaged burner.
3. Gas regulator defective.
1. Clean burner (see Cleaning
and Maintenance , page 28)
or replace burner orifice.
2. Replace damaged burner.
3. Replace gas control.
Slight smoke or odor during
initial operation. 1. Residues from manufacturing
processes and logs curing.
1. Problem will stop after a few
hours of operation.
Heater produces a whistling
noise when burner is lit. 1. Air in gas line.
2. Dirty or partially clogged
burner orifice.
1. Operate burner until air is
removed from line. Have gas
line checked by local propane/
LP or natural gas company.
2. Clean burner (see Cleaning
and Maintenance , page 28)
or replace burner orifice.
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Continued