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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.
Replace pressure
DEFINITION
An error has occurred with the PS2 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.
S9V2-VS-SVX001-1C-EN
3.3 Fault Code
Cycle power OFF, then ON to
correctly for the
Is 24 volts present,
measured across PS2?
NO
switch
(brown to yellow)?
3.4 Fault Code
Cycle power to the furnace
and call for 2nd stage heat.
Pressure switch
measured across PS2
NO
is okay.
than pressure switch
Check PS hose, flue piping for
obstruc on and confirm vent size is
the furnace
Is PS2 oriented
NO
applica on?
YES
YES
See Note #1
Is PS2 oriented
Correct orienta on
correctly for the
NO
See in this document
applica on?
YES
Is the inducer
NO
motor running?
YES
Is 24 volts present,
(orange to yellow)?
See Note #1
YES
Is pressure greater
label?
YES
See Note #2
NO
correct
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
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 voltage measured
from
RD- WH
NO
BK-RD
BK-WH
at the inducer motor?
YES
Call Technical Support
Replace pressure switch.
Check opera on.
Replace inducer
assembly
99
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