C474 - Heatsink sensor error

What does C474 mean?

The air conditioner has detected an error with the heatsink temperature sensor. This sensor monitors the temperature of critical power components.

• Faulty heatsink sensor
• Loose sensor connection
• Internal control board issue

Click steps to track your progress.

1. 1

   Turn off the air conditioner at the main power supply, wait 5 minutes, then restart.

2. 2

   Ensure the outdoor unit has good ventilation and is not in an excessively hot environment.

3. 3

   Check for any visible damage or loose wires around the heatsink area (if accessible and safe).

4. 4

   If the error persists, contact a qualified service technician.