S2125 NOT COMMUNICATING — No connection with indoor or control module

What does S2125 NOT COMMUNICATING mean?

The NIBE S2125 Heat Pump is not communicating with its paired indoor module or control module, which could be due to installation or cable issues.

• S2125 is not correctly installed in the indoor module or control module.
• The communication cable is not correctly connected or is faulty.

Click steps to track your progress.

1. 1

   Check that S2125 is correctly installed and recognized by the indoor module or control module.

2. 2

   Inspect the communication cable connected to terminal block X22:1–4 (on AA2) for damage or loose connections.

3. 3

   Ensure the cable is securely connected at both the S2125 and the indoor module/control module ends.

4. 4

   Consult the Installer Manual for the indoor module/control module for specific connection diagrams.