E54 - Low or high pressure sensor (PSL/PSH) disconnected/output error

What does E54 mean?

This error indicates that either the low-pressure sensor (PSL) or the high-pressure sensor (PSH) in the outdoor unit is disconnected or experiencing an output error.

• Loose or disconnected wiring to the PSL or PSH sensors.
• Faulty PSL or PSH sensors.
• Damage to the sensor wiring.
• Problem with the outdoor unit's control board receiving sensor data.

Click steps to track your progress.

1. 1

   Turn off the main power supply to the outdoor unit at the circuit breaker.

2. 2

   Have a qualified technician inspect both the low (PSL) and high (PSH) pressure sensors and their wiring connections.

3. 3

   Ensure all connections are secure and free from corrosion or damage.

4. 4

   The technician will test the sensors' functionality and replace any faulty ones.