www.fmiproducts.com
125525-01E
29
INSPECTING BURNERS
Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure 56 shows a correct pilot flame pattern.
Figure 57 shows an incorrect pilot flame pat-
tern. The incorrect pilot flame is not touching
the thermocouple. This will cause the thermo-
couple to cool. When the thermocouple cools,
the heater will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 57
• turn heater off (see
To Turn Off Gas to Ap-
pliance
, page 28
• see
Troubleshooting
, page 32
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.
Figure 56 - Correct Pilot Flame Pattern
(Your pilot may vary from pilots shown)
Pilot Burner
Thermocouple
Thermocouple
Figure 57 - Incorrect Pilot Flame Pattern
(Your pilot may vary from pilots shown)
Thermocouple
Thermocouple
Pilot Burner
FRONT BURNER FLAME PATTERN
Figure 58 shows correct front burner flame
pattern. Figure 59 shows incorrect front burner
flame pattern. The incorrect burner flame pat-
tern shows yellow tipping at top of blue flame.
WARNING: If yellow tipping
occurs, your heater could pro
-
duce increased levels of carbon
monoxide. If front burner flame
pattern shows yellow tipping,
follow instructions at bottom of
this page. Yellow flame on rear
burner is normal.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles are burned
by heater, causing brief patches
of orange flame.
Figure 58 - Correct Front Burner Flame
Pattern
If front burner flame pattern is incorrect, as
shown in Figure 59
• turn heater off (see
To Turn Off Gas to Ap-
pliance
, page 28
• see
Troubleshooting
, page 32
Figure 59 - Incorrect Front Burner Flame
Pattern
Yellow Tipping
At Top of Blue
Flame
Propane/LP Gas Pilot
Natural Gas Pilot
Propane/LP Gas Pilot
Natural Gas Pilot
