Low/High Pressure Sensor Disconnection/Output Error

What does E54 mean?

This error indicates a disconnection or output error with either the low-pressure sensor (PSL) (E54-1) or the high-pressure sensor (PSH) (E54-2). This prevents accurate pressure monitoring, jeopardizing system safety and control.

• Disconnection of the low or high-pressure sensor.
• Pressure sensor outputting an invalid signal, possibly due to internal failure.
• Faulty wiring harness between the pressure sensor and the control board.

Click steps to track your progress.

1. 1

   Check the low-pressure sensor (PSL) and high-pressure sensor (PSH) connections for security and physical damage.

2. 2

   Measure the output voltage or resistance of both PSL and PSH sensors and compare to specification.

3. 3

   Verify the wiring continuity from the sensors to the outdoor unit PCB, checking for breaks or short circuits.