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