Trane S8V2A040M3PC Installation, Operation And Maintenance Manual page 73

Defini on:
The IFC has detected that internal gas valve
relays have failed.
Defini on:
The onboard 5 amp fuse is open or missing.
Correct low voltage
NO
wiring
S8V2-SVX001-1A-EN
Replace fuse YES
Start unit and
measure amp draw
on transformer
24VAC red wire
Is amp draw less
YES
than 5 amps?
11 Fault Code
Verify all wiring
Replace IFC
12 Fault Code
Apply power to the
unit and verify
24VAC from TH TR
Is 24 VAC
measured across
the fuse terminals?
Turn on each accessory (if
installed) and measure amp
draw. If amp draw exceeds
fuse ra ng, correct wiring
associated with that accessory
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
Is fuse fully
NO seated into NO
connector?
YES
Replace IFC
Properly seat the
fuse
73