Communication error between main and inverter microcontrollers — Internal communication fault

What does Communication error between indoor/outdoor INV MAIN MICOM (1 min) mean?

This error indicates a communication failure between the main microcontroller (MAIN MICOM) and the inverter microcontroller (INVERTER MICOM) within the outdoor unit. This prevents proper operation and will cause the system to stop.

• Faulty MAIN MICOM within the outdoor unit.
• Faulty INVERTER MICOM within the outdoor unit.

Click steps to track your progress.

1. 1

   Turn off the air conditioner at the main breaker, wait 30 seconds, then turn it back on to reset internal components.

2. 2

   Ensure all internal connections within the outdoor unit are secure, if safely accessible.

3. 3

   If the problem persists, a qualified service technician will need to check or replace the microcontrollers.