5201 — High-pressure sensor (63HS) trouble

What does 5201 mean?

This code indicates a problem with the high-pressure sensor (63HS), specifically if it detects a pressure of 1 kgf/cm² or less during operation. When this low pressure is detected, the compressor stops and enters a 3-minute anti-restart mode to protect the system. If the pressure remains low before a restart, it triggers an abnormal stop.

• A faulty high-pressure sensor (63HS) itself.
• Refrigerant gas leakage, leading to a decrease in the system's internal pressure.
• Loose, disconnected, or damaged wiring or connector to the high-pressure sensor.
• A malfunction in the outdoor controller board's input circuit for the sensor.

Click steps to track your progress.

1. 1

   Turn off the main power to the unit at the circuit breaker for safety.

2. 2

   Carefully inspect the wiring and connector for the high-pressure sensor (63HS) on the outdoor unit for any disconnections, looseness, or damage. Securely reconnect any loose parts.

3. 3

   Turn the power back on and observe if the error clears. The system may need a few minutes to normalize.

4. 4

   If the problem persists, it may indicate a refrigerant leak and decreased internal pressure, which requires a qualified HVAC technician to repair and recharge the system.