Comm.fault In — Communication fault with input card

Was bedeutet Comm.fault In ?

This alarm indicates missing communication with the input card (AA3). This blocks the relevant compressor, and if the heat pump is master, the supply is set to minimum.

• Defective communication cables
• Input card (AA3) malfunction

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Check all communication cables and connections to the input card (AA3).

2. 2

   Ensure cables are securely connected.

3. 3

   If the problem persists, the input card may need replacement by a technician.