Error E54-1 / Outdoor Red LED Flashes Once — Low pressure sensor (PSL) disconnection/output error

What does E54-1 / Outdoor Red LED 1 flash mean?

Error E54-1, indicated by one flash of the outdoor unit's red LED, signifies a disconnection or output error from the low pressure sensor (PSL). This sensor monitors system pressure.

• Low pressure sensor (PSL) disconnection/output error

Click steps to track your progress.

1. 1

   Turn off the main power supply to the outdoor unit.

2. 2

   Locate the low pressure sensor (PSL) and inspect its connection to the outdoor PCB.

3. 3

   Ensure the connector is secure and free from corrosion or damage.

4. 4

   If the connection is good, the sensor itself may be faulty and require replacement.

5. 5

   Contact a professional technician for diagnosis and replacement.