System Error (Transmitting/Receiving Signal)

What does P3 mean?

A communication error exists within the system, specifically related to transmitting or receiving signals between components. This impedes control and feedback, causing operational issues.

1. 1

   Inspect communication wiring connections on both indoor and outdoor unit PCBs for secure seating and damage.

2. 2

   Verify that DIP switch settings for communication addresses are unique and correctly configured.

3. 3

   Check for external electrical noise sources near communication lines that could interfere with signals.