Trane A952V040BU3SB Installation, Operation And Maintenance Manual page 105

DEFINITION
st
1 Stage Gas Valve not energized when it should
be 10 mes within the same call for heat .
24VAC not sensed on MVL 10 mes
DEFINITION
High limit output relay is not closed when it
should be
24VAC not sensed on HLO 10 mes
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.
A952V-SVX001-1B-EN
Replace pressure
NO
switch
2.3 Fault Code
Replace IFC
2.4 Fault Code
Replace IFC
3.1 Fault Code
Is PS1 oriented
correctly for the NO
applica on?
YES
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
Correct orienta on
See this document
Verify wiring. If
correct, replace IFC
105