Code P1: Discharge pipe high pressure protection
Issue Description & Safety Warning
The Trane TVR Pro VRF (220V) has triggered a critical Discharge pipe high pressure protection 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: No Display: Displayed on the unit with the error Description: Discharge pipe high pressure protection. If the system has a 3-phase protector and the 3-phase protector is connected with the high pressure switch, the system will display P1 protection when initially powered on, and P1 protection will disappear once the system reaches a steady state. All units stop running. Error code is only displayed on the unit with the error. Trigger condition: Discharge pressure ≥ 4.4MPa. Recover condition: Discharge pressure ≤ 3.2MPa. Reset method: Resume automatically. Possible causes: - Outdoor unit stop valves are closed. - Pressure sensor/switch not connected properly or has malfunctioned. - Excess refrigerant. - System contains air or nitrogen. - High pressure side blockage. - Poor condenser heat exchange. - Main PCB damaged.
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 P1 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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