DEFINITION:
The flame sense current is less
than 0.5 micro-amp DC
Once flame has been
established, set meter to DC
volts and measure across
flame sense pads labeled FP
Is flame current
measured less than 0.5
micro-amp DC?
Replace flame
sensor
Check opera!on
Is flame sensor
located correctly?
See figure
YES
YES
Correct flame sensor
loca!on
NO
Flame sensor is good.
Check wiring and / or
connec!ons.
NO
08 Fault Code
Flame Sensor
Make a call for 1
st
stage hea!ng
There are two flame sense pads located on the IFC,
marked “FP”. To measure flame current, use a VOM set
to DC volts. Flame current will vary depending on the
type of meter used. Typical flame current ranges from
0.75 – 3.0 micro-amps (0.75 – 3.0 VDC)
Ensure all burner flames directed into
heat exchanger with a !ght pa#ern?
(inadequately aired burners tend to
roll back)
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