YES
YES
Is pressure greater
than pressure switch
label?
See Note #2
Replace pressure switch.
Check opera!on.
Is the inducer
motor running?
Is 24 volts present,
measured across PS2
(orange to yellow)?
See Note #1
Note #1
24 volts = Open Switch
0 volts = Closed Switch
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.
Note #2
Measured pressure is
nega!ve, greater than refers
to magnitude only.
3.4 Fault Code
NO
Cycle power to the furnace
and call for 2nd stage heat.
NO
Check PS hose, flue piping for
obstruc!on and confirm vent size is
correct
NO
Pressure switch
is okay.
Is voltage measured
from
RD- WH
BK-RD
BK-WH
at the inducer motor?
Replace inducer
assembly
NO
Is PS2 oriented
correctly for the
applica!on?
Correct orienta!on
See in this document
NO
YES
YES
Call Technical Support
YES
See Note #1
Note #1
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.
3.3 Fault Code
NO
YES
OL = Open Switch
0 ohms = Closed Switch
Cycle power OFF to the
furnace and remove
Brown wire from PS2.
Verify wiring.
correct, replace IFC
Is con!nuity (0 ohms)
measured across PS2?
Replace pressure
switch and verify
opera!on
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