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113052-01D
18
Thermocouple
Pilot Burner
Pilot Burner
Thermocouple
Blue Flame
Yellow Flame
Figure 27 - Correct Pilot Flame Pattern
Figure 28 - Incorrect Pilot Flame Pattern
Figure 29 - Correct Burner Flame Pattern
INSPECTING HEATER
Check pilot flame pattern and burner flame pat-
tern often.
PILOT FLAME PATTERN
Figure 27 shows a correct pilot flame pattern.
Figure 28 shows an incorrect pilot flame pattern.
The incorrect 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 28
• turn heater off (see To Turn Off Gas to Ap
-
pliance, page 15 or 17, depending on your
model)
• see Troubleshooting
, page 20
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 30 - Incorrect Burner Flame
Pattern
BURNER FLAME PATTERN
Figure 29 shows a correct burner flame pattern. Fig-
ure 30 shows an incorrect burner flame pattern.
If burner flame pattern is incorrect, as shown in
Figure 30
• turn heater off (see To Turn Off Gas to Ap
-
pliance, page 15 or 17, depending on your
model)
• see Troubleshooting
, page 20