Trane S9V2B040U3PSBC/D Installation, Operation And Maintenance Manual page 112

T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g
DEFINITION:
Flame is sensed when it
should not be.
Install drip leg per
Na onal Fuel Gas
Installa on
Instruc ons
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)
112
YES
Code and NO
05 Fault Code
Is flame seen
with no call for
heat?
NO
Is flame current
measured across NO
FS pads?
YES
Disconnect power to
unit
Turn off gas supply!
Remove gas valve
Are there signs of
moisture or debris in the
inlet gas screen?
YES
Inspect gas supply
for leaks and have
gas supplier check
gas quality
NO
Is there a drip leg installed
on inlet gas piping per
installa on instruc ons?
YES
Using a back-up wrench,
install new gas valve
Check opera on
Replace IFC
Possible Causes:
Flame sense wire shorted to ground
Flame sensor is grounded
S9V2-SVX001-1A-EN