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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.
A801X-SVX001-1A-EN
Replace pressure
NO
switch
3.1 Fault Code
Cycle power to the furnace
st
and call for 1 stage heat.
Is 24 volts present ,
measured across PS1
YES
( orange to yellow)?
See Note #1
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
Verify wiring. If
correct, replace IFC
55
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