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115254-01A 27
INSPECTING BURNERS
Check pilot flame pattern and burner flame pat-
terns often.
PILOT FLAME PATTERN
Figure 43 shows a correct pilot flame pattern. Figure
44 shows an incorrect pilot flame pattern. The incor
-
rect pilot flame is not touching the thermocouple.
This will cause the thermocouple to cool. When the
thermocouple cools, the heater will shut down.
If pilot flame pattern is incorrect, as shown in
Figure 44
• turn heater off (see To Turn Off Gas to Appli
-
ance, page 23 [Manually-Controlled Models]
or page 25 [Remote-Ready Models])
• see Troubleshooting
, page 29
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 43 - Correct Pilot Flame Pattern
(Your pilot may vary from pilots shown)
Pilot Burner
Thermocouple
Figure 44 - Incorrect Pilot Flame Pattern
(Your pilot may vary from pilots shown)
Thermocouple
Pilot Burner
FRONT BURNER FLAME PATTERN
Figure 45 shows correct front burner flame pat-
tern. Figure 46 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 46
• turn heater off (see To Turn Off Gas to Appli
-
ance, page 23 [Manually-Controlled Models]
or page 25 [Remote-Ready Models])
• see Troubleshooting
, page 29
P
I
L
O
T
O
F
F
O
N
L
O
H
I
Figure 45 - Correct Front Burner Flame
Pattern
Figure 46 - Incorrect Front Burner Flame
Pattern
P
I
L
O
T
O
F
F
O
N
L
O
H
I