Trane S8B1A040M3PSCA/C Installation, Operation And Maintenance Manual page 66

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
An error has occurred with the PS2, indica ng that the pressure
switch is closed when it should be open.
In most cases, the pressure switch is not the problem.
NOTE: Verify pressure switch wiring and tube rou ng
are correct.
66
Verify wiring. If
NO
correct, replace IFC
3.3 Fault Code
Cycle power OFF to the
furnace and remove
Brown wire from PS2.
Is con nuity (0 ohms)
YES
measured across PS2?
See Note #1
Note #1
OL = Open Switch
0 ohms = Closed Switch
Replace pressure
switch and verify
opera on
S8XB-SVX001-1C-EN