Trane S8V2A040M3PC Installation, Operation And Maintenance Manual page 71

DEFINITION: External Gas Valve
Circuit Error (24 volts is present
when it should not be present)
DEFINITION: The HLO (High Limit
Out) relay on the IFC is stuck ON
S8V2-SVX001-1A-EN
7.1 Fault Code
Turn Comfort
Control to "OFF"
posi on
Is 24 VAC nominal voltage present
between Red lead at gas valve
connec on to chassis ground?
NO
Replace IFC
7.2 Fault Code
Turn Comfort
Control to "OFF"
posi on
Is 24 VAC nominal voltage
measured from HLO
to common?
NO
Replace IFC
Correct wiring
YES
Check opera on
Cycle power
YES
to the unit.
Does the error clear?
NO
Verify Opera on
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
71