Trane S8V2A040M3PC Installation, Operation And Maintenance Manual page 78

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
DEFINITION:
This fault is generated when the Supply temperature
sensor is Open / Shorted or when the sensor has been
enabled but not installed/plugged in.
NOTE:
This error does not affect opera on of the
furnace. It can be cleared by disabling the Supply
Temperature using the mobile diagnos cs app or by
using the Menu / Op on bu ons. (24VAC mode only)
78
E28 Fault Code
Measure the DC voltage between the pins
at connecter E22 (SUP_T) on the IFC
Refer to the Thermistor table
Unplug connector E22 and verify ~3.2 Vdc between
pins Replace IFC if voltage is less than 3Vdc
Turn Power OFF to the furnace
Remove the Supply temperature sensor and
measure the resistance
Refer to the Thermistor table
If resistance reading is Open or Shorted,
replace the Supply temperature sensor
BAYSENC360
S8V2-SVX001-1A-EN