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6. Burner backfiring during
combustion
7. Slight smoke or odor
during initial operation
8. Heater produces a whist-
ling noise when burner is
lit
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
1. Clean burner (See “Clean-
ing 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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