Trane S8B1A040M3PSCA/C - Troubleshooting; 3.1 Fault Code

64
S8XB-SVX001-1C-EN
,
Is connuity (0 ohms)
measured across PS1?
See Note #1
Note #1
OL = Open Switch
0 ohms = Closed Switch
DEFINITION
An error has occurred with the PS1, 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.
3.1 Fault Code
Cycle power OFF to the
furnace and remove
Orange wire from PS1.
.
NO
Replace pressure
switch and verify
operaon
.
YES
Verify wiring. If
correct, replace IFC
TTrroouubblleesshhoooottiinngg