A801X-SF-1A-EN
25
Is 24 volts present,
measured across the
pressure switch
(orange to yellow)?
See Note #1
Note #1
24 volts = Open Switch
0 volts = Closed Switch
DEFINITION
An error has occurred with the PS, indica!ng that the pressure
switch is closed when it should be open.
In most cases, the pressure switch is not the problem.
If winds
are in excess of 15mph, a 90 degree elbow may be required to
inhibit the switch from closing
NOTE: Verify pressure switch wiring and tube rou!ng
are correct.
3.1 Fault Code
Cycle power to the furnace
and call for heat.
NO
Replace pressure
switch
Verify wiring. If
correct, replace IFC
YES
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