Trane S8V2A040M3PC Installation, Operation And Maintenance Manual page 64

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.
DEFINITION
An error has occurred with the PS2 indica ng that the pressure
switch is either open when it should be closed.
In most cases, the pressure switch is not the problem.
NOTE: Verify pressure switch wiring and tube rou ng
are correct.
64
Cycle power OFF, then ON to
Replace pressure
NO
switch
PS1 is closed
YES
Pressure
NO
switch is okay.
obstruc on and/or confirm vent
3.3 Fault Code
the furnace
Is PS2 oriented
NO
correctly for the
applica on?
YES
Is 24 volts present,
measured across PS2?
YES
(brown to yellow)?
See Note #1
3.4 Fault Code
Cycle power to the furnace
nd
and call for 2 stage heat.
NO
Is the inducer
NO
motor running?
Does the igniter
glow within 60
seconds?
Is 24 volts present,
measured across PS1
(orange to yellow)?
See Note #1
YES
Is pressure
greater than
YES
pressure switch
label?
See Note #2
NO
Check PS hose, flue piping for
size is correct
Note #1
24 volts = Open Switch
0 volts = Closed Switch
Correct orienta on
See in this document
Verify wiring
Note #1
24 volts = Open Switch
0 volts = Closed Switch
Note #2
Measured pressure is
nega ve, greater than refers
to magnitude only.
Is ~120VAC
measured from BK
NO
to WH on the
inducer motor?
Replace Inducer
YES
Assembly
Replace pressure switch.
Check opera on.
Replace IFC
S8V2-SVX001-1A-EN