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Fault
Burner and Pilot flame
color is yellow.
Burner flame is too
high or too low.
Yellow tipping of flames
Flashback or backfire
Possible Cause
Wrong gas type used.
Wrong orifice installed.
Air shutter is partially or fully
closed. Not enough
combustion air.
Pressure is too high or too
low.
Burner injector used is not
appropriate for the gas type
used.
Incorrect gas type used.
Faulty safety gas valve.
Lack of primary air due
incorrect air shutter
adjustment.
Lint and dust may have
blocked primary air openings
or have collected inside the
burner tube or on the
underside of the burner ports
which reduced primary air
injection.
The burner orifice/injector
might have spun out of line.
Blocked or clogged injector
orifice.
Too much primary air.
Wrong injector orifice size
installed.
If flashback occurs when the
burner gas valve is in an OFF
position. The gas valve is
probably leaking.
Gas pressure is too low.
Faulty or clogged burner.
Operated from cold start.
Warm up stage.
The main burner injector and
burner are not aligned with
each other.
Check the gas type used, change to the correct
gas type.
Check the orifice installed. Replace it with
correct orifice for the gas type used.
Adjust the air shutter of the burner to
eliminate the yellow flame.
Adjust pressure to standard. See standard
pressure settings.
Change the burner injector to appropriate gas
type used.
Change gas type used based on the product's
rating label.
Replace safety gas valve.
Open air shutters to get rid of yellow flame.
a. Clean and re-adjust the burners' air
shutter.
b. Replace the burners if necessary.
Check and re-align the injector to the burner.
a. Check and clean the injector orifice.
b. Replace it if necessary.
Adjust the air shutter of the burner to minimize
primary air input.
Check the orifice size of the injector installed.
Replace injector if necessary.
Replace the gas valve.
Adjust the gas supply pressure to required
standard.
Clean the burner or replace it if necessary.
Allow the appliance to heat up.
Align the main burner injector with the burner.
28
Remedy
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