Is 24 volts present
,
measured across PS1
(
orange to yellow)?
See Note #1
Note #1
24 volts = Open Switch
0 volts = Closed Switch
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.
3.1 Fault Code
Cycle power to the furnace
and call for 1 stage heat.
NO
Replace pressure
switch
Verify wiring. If
correct, replace IFC
YES
st
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