Trane A952V040BU3SB Installation, Operation And Maintenance Manual page 106

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 PS1 indica ng that the pressure
switch is 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.
PS1 Open errors can occasionally occur when wind gusts occur.
The IFC will a empt to close both PS1 by increasing the voltage to
the inducer motor
PS1 is closed
106
3.2 Fault Code
correctly for the
Cycle power to the furnace
and call for 1
Yes
Is 24 volts present,
Pressure switch measured across PS1
NO
is okay. (orange to yellow)?
Is pressure greater
than pressure switch
Possible Causes:
PS hose, flue piping for obstruc on
and/or confirm vent size is correct
Is PS1 oriented
NO
applica on?
st
stage heat.
NO
Is the inducer
NO
motor running?
YES
Does the igniter
glow within 60
seconds?
Verify no voltage at IFC
NO
See Note #1
YES
YES
label?
See Note #2
NO
Note #1
24 volts = Open Switch
0 volts = Closed Switch
Note #2
Measured pressure is
nega ve, greater than refers
to magnitude only.
Correct orienta on
See this document
Is voltage measured
from
RD- WH
BK-RD YES
BK-WH
at the inducer
motor
NO
Replace IFC
Replace pressure switch.
Check opera on.
A952V-SVX001-1B-EN
Replace inducer
assembly