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Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure 63 shows a correct pilot flame pattern.
Figure 64 shows an incorrect pilot flame pat-
tern. The incorrect pilot flame is not properly
heating the thermocouple. When the thermo-
couple cools, the heater will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 64
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 24)
• see Troubleshooting, page 33
Note: The pilot flame on natural gas units will
have a slight curve, but flame should be blue
and have no yellow or orange color.
Thermocouple
f i r e - p a r t s . c o m
Figure 63 - Correct Pilot Flame Pattern
Thermocouple
Figure 64 - Incorrect Pilot Flame Pattern
MAIN BURNER
Periodically inspect all burner flame holes with
the heater running. All slotted burner flame
holes should be open with yellow flame pres-
ent. All round burner flame holes should be
open with a small blue flame present. Some
burner flame holes may become blocked by
debris or rust, with no flame present. If so,
turn off heater and let cool. Remove blockage.
Blocked burner flame holes may create soot.
FRONT BURNER FLAME PATTERN
WARNING: If front burner
flame pattern shows yellow tip-
ping, your fireplace could pro-
duce increased levels of carbon
monoxide. Follow instructions
below. Yellow flame on rear
burner is normal.
30
INSPECTING BURNERS
Pilot Burner
Pilot Burner
www.lennoxhearthproducts.com
NOTICE: Do not mistake orange
flames with yellow tipping.
Dirt or other fine particles are
burned by fireplace, causing
brief patches of orange flame.
Figure 65 shows the correct burner flame.
The front ember burner should have a small
blue flame. When the ember material is ap-
plied, the embers will glow red and the flame
may have a few small bright yellow tips less
than 1/2 inch in height.
The middle burner produces a blue flame
that impinges upon the ceramic ramp caus-
ing the ramp to glow red with an occasional
yellow streak.
The rear burner produces a bright yellow
flame with the base of the flame being blue.
Figure 66 shows the incorrect burner flame.
The front ember burner should not produce
yellow flames greater than 1/2" in height or
any dark yellow or orange flames.
The middle burner should not produce flame
that remains yellow or yellow flame that ex-
tends above the ceramic ramp.
The rear burner should not produce a dark
yellow / orange flame nor should it be absent
of blue color near the base of the flame next
to the shiny stainless steel burner..
If burner flame pattern is incorrect, as shown
in Figure 66.
• turn fireplace off (see To Turn Off Gas to
Appliance, page 24)
• see Troubleshooting, page 33
Figure 65 - Correct Burner Flame Pattern
Yellow Tipping
At Top of Blue
Flame
Figure 66 - Incorrect Burner Flame
Pattern
126544-01A
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