PC12 — Outdoor unit main control board DC bus high voltage protection / 341 Machine Check Error (MCE) error

What does PC12 mean?

This code indicates high DC bus voltage on the main control board, possibly accompanied by a Machine Check Error (MCE). This suggests a critical electrical fault.

• Significant power surge or fluctuation
• Failure of internal components on the main control board
• Issues with power regulation circuits

Click steps to track your progress.

1. 1

   Protect the unit from electrical surges.

2. 2

   Perform a power reset: turn off the main power for 30 seconds, then restore it.

3. 3

   Given the critical nature of this error, professional service is required to diagnose and repair the main control board.