S9V2-SF-2A-EN
51
DEFINITION:
Flame is sensed when it
should not be.
Is there a drip leg installed
on inlet gas piping per
installa!on instruc!ons?
Using a back-up wrench,
install new gas valve
Check opera!on
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
Na!onal Fuel Gas
Code and
Installa!on
Instruc!ons
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 IFC
NO
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)
