DEFINITION:
Flame is sensed when it
should not be.
Is there a drip leg installed
on inlet gas piping per
installaon instrucons?
Using a back-up wrench,
install new gas valve
Check operaon
Inspect gas supply
for leaks and have
gas supplier check
gas quality
Are there signs of
moisture or debris in the
inlet gas screen?
YES
Install drip leg per
Naonal Fuel Gas
Code and
Installaon
Instrucons
YES
NO
Disconnect power to
unit
Turn off gas supply!
Remove gas valve
05 Fault Code
Is flame current
measured across
FS pads?
YES
Is flame seen
with no call for
heat?
YES
Replace IFCNO
NO
Possible Causes:
Flame sense wire shorted to ground
Flame sensor is grounded
NO
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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