Symptom
Possible Cause
Corrective Action
8. Floating flames,
lazy ill-defined,
quiet flames, which
roll around,
sometimes
completely off of
the port,
sometimes with
overly, yellow tips.
Possible sooting.
Usually
accompanied by
the odor of
aldehydes.
A. Potentially dangerous
incomplete combustion due
to incorrect air to fuel ratio
(lack of combustion air or
excessive fuel delivery I.e.
excessive gas pressure,
overrating of appliance).
B. Incorrect air
intake/exhaust flow system.
Causes may be:
B1. Blocked burner.
B2. Blocked primary air
B3. Blocked secondary air
inlets
A. Check the appliance input rate and reduce if necessary.
The air intake/exhaust flow system may be too restrictive or
blocked (the rate at which the exhaust leaves [draft]
determines the rate at which the combustion air is delivered).
Poor draft results in insufficient air delivery or a restricted
exhaust. Correct air intake/exhaust flow system.
B1. Clear ports.
B2. Clear obstructions.
B3. Clear obstructions.
C. If gas pressures are correct and the flames stay the same,
adjust the air shutter for a proper burn.
9. Burner
flashback. Air-gas
mixture ignites
inside the burner
near the orifice,
usually creating a
roaring noise like a
blowtorch. The
problem is an
imbalance of gas
flow velocity and
burning speed
pattern.
A. Excessive.
B. Burner input underrated.
C. Valve leak if flashback
occurs with burner valve in
off position.
D. Improper gas pipe size.
A. Adjust the air shutter for a proper burn.
B. Check input rate. Check input pressure using a manometer.
Confirm correct gas pressure at house meter or tank (call gas
company). Confirm burner orifice size.
C. Replace valve. If above corrections do not eliminate
flashback, replace burner.
D. Correct plumbing.
10. Delayed
ignition (makes a
sudden "whoosh"
noise as the burner
lights). This is a
buildup of gas prior
to ignition. This is
more prevalent with
propane (LP) fuel.
A. Incorrect air-to-fuel ratio.
A1. Primary air incorrect.
A2. Burner ports plugged.
B. Improper log placement.
A1. Adjust the air shutter for a proper burn.
A2. Open ports to allow for proper travel of flames.
B. Reposition logs to eliminate interference with flame travel.
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