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OBSERVED
PROBLEM
Burner does not light after ODS/
Pilot is lit
Delayed ignition of burner
Burner backfiring during
combustion
Slight smoke or odor during
initial operation
Heater produces a whistling
noise when burner is lit
POSSIBLE
CAUSE
1. Burner orifice is clogged
2. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice is clogged
1. Burner orifice is clogged or
damaged
2. Burner damaged
3. Gas regulator defective
1. Residues from manufacturing
process
1. Turning control knob to “HI”
position when burner is cold
(if equipped with this type of
valve)
2. Air in gas line
3. Air passageways on heater
blocked
4. Dirty or partially clogged
burner orifice
SOLUTION
1. Clean burner (see Cleaning
and Maintenance) or replace
burner orifice
2. Contact local propane gas
company
1. Contact local propane gas
company
2. Clean burner (see Cleaning
and Maintenance) or replace
burner orifice
1. Clean burner (see Cleaning
and Maintenance) or replace
burner orifice
2. Replace burner
3. Replace gas regulator
1. Problem will stop after a few
hours of operation
1. Turn control knob to “LOW”
position and allow to warm
2. Operate burner until air is
removed from line. Call
local propane company to
check gas line.
3. Observe minimum
installation clearances
4. Clean burner or replace
orifice
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