OWNER’S MANUAL Model # 8890 DVI-Ht
Page 28 of 32
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.
