High Pressure Sensor (PSH) Disconnection/Output Error

What does E54-2 mean?

The high-pressure sensor (PSH) is either disconnected or its output signal is erroneous, indicating a fault in the sensor or its connection to the system. This specifically refers to the PSH.

1. 1

   Inspect the PSH sensor's connector on the outdoor unit PCB — verify it is securely seated.

2. 2

   Measure the output voltage or resistance of the PSH sensor according to manufacturer specifications using a multimeter.

3. 3

   Check continuity of the wiring connecting the PSH sensor to the PCB.