2.3 Fault Code
DEFINITION
1
st
Stage Gas Valve not energized when it should
be 10 !mes within the same call for heat .
24VAC not sensed on MVL 10 mes
Replace IFC
See Note #1
Note #1
OL = Open Switch
0 ohms = Closed Switch
DEFINITION
An error has occurred with the PS1, indicating 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 routing
are correct.
3.1 Fault Code
NO
YES
Cycle powser OFF to the
furnace and remove
brown wire from PS1.
Verfiy wiring.
If correct, replace
IFC
Is continuity(0 ohms)
measured across
PS1?
Replace pressure
switch and verify
operation
2.4 Fault Code
DEFINITION
High limit output relay is not closed when it
should be
24VAC not sensed on HLO 10 mes
Replace IFC
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