Trane 4TVH0086FE000AA Service Manual page 92

2.10 F6: Electronic expansion valve connection error
Digital display output
In the error code, 'x' is a placeholder for the EXV system, with 1 representing EXVA, 2 representing EXVB, and 3 representing
EXVC.
Description
 Electronic expansion valve connection error.
 All units stop running.
 Error code is only displayed on the unit with the error.
Trigger / recover condition
 Trigger condition: The main control board cannot receive the feedback signal of EXV.
 Recover condition: The main control board can receive the feedback signal of EXV.
 Reset method: When the main control board can receive the feedback signal of EXV, F6 flashes, a manual system restart
id required before the system can resume operation.
Possible causes
 Electronic expansion valve coil not connected properly or has malfunctioned.
 Damaged main PCB.
91