Trane TVR Pro CO Series Service Manual page 73

2.10 F6: Electronic expansion valve connection error
Digital display output
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.
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