Code xF6: Electronic expansion valve connection error
Issue Description & Safety Warning
The Trane TVR Pro VRF (220V) has triggered a critical Electronic expansion valve connection error alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Manual restart required: Yes Display: Displayed on the unit with the error (refer to Note 3: once the EXV is connected properly, the code flashes and a manual restart is required) Note: 'x' is a placeholder for the compressor system — 1 = compressor system A, 2 = compressor system B (e.g. 1F6 / 2F6). Description: Electronic expansion valve connection error. All units stop running. Error code is only displayed on the unit with the error. 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 is required before the system can resume operation. Possible causes: - Electronic expansion valve coil not connected properly or has malfunctioned. - Damaged main PCB.
Source: Trane 220V TVR Pro VRF Service Manual — Part 6 Diagnosis and Troubleshooting
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Trane TVR Pro VRF (220V) Alarms
Trane controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code xF6 on the TVR Pro VRF (220V) identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Trane's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 38 Trane TVR Pro VRF (220V) codes.
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