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Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure 37 shows a correct pilot flame pattern.
Figure 38 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 38
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 20.
• see Troubleshooting, page 26
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.
Pilot Burner
Thermocouple
Figure 37 - Correct Pilot Flame Pattern
(Your pilot may vary from pilots shown)
Pilot Burner
Thermocouple
Figure 38 - Incorrect Pilot Flame Pattern
(Your pilot may vary from pilots shown)
24
INSPECTING bURNERS
www.desatech.com
FRONT BURNER FLAME PATTERN
Figure 39 shows correct front burner flame
pattern. Figure 40 shows incorrect front
burner flame pattern. The incorrect burner
flame pattern 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.
If front burner flame pattern is incorrect, as
shown in Figure 40
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 20.
• see Troubleshooting, page 26.
Figure 39 - Correct Front Burner Flame
Yellow Tipping
At Top of Blue
Flame
Figure 40 - Incorrect Front Burner Flame
Pattern
Pattern
123220-01C
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