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
Make a call for 1
stage hea!ng
st
.442 REF
1.470 REF
Flame Sensor
.385 REF
.585 REF
1.586 REF
.239 REF
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)
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