Alarm Heat Pump Z2 pressure sensor low pressure JR0 faulty

What does 5437 mean?

This alarm indicates a fault with the low-pressure sensor JR0 for Heat Pump Z2. This could be due to a wiring issue or a defective sensor. It triggers after 3 faults in 2 hours, or 15 minutes of constant failure.

• Loose connection or gap in cabling at terminals 17, 19 on the I/O board.
• Defective I/O board.
• Defective pressure sensor JR0.

Click steps to track your progress.

1. 1

   Visually inspect the cabling and terminal connections 17 and 19 on the I/O board to ensure they are secure.

2. 2

   If the alarm persists, contact a qualified technician to diagnose the pressure sensor or I/O board.

3. 3

   Contact customer support for further assistance.