Error 180 — Simultaneous opening of cooling/heating MCU SOL V/V (1st detection)

What does 180 mean?

This error occurs when the cooling and heating solenoid valves within the MCU are detected as being open simultaneously for the first time. This indicates a refrigerant flow conflict.

• Malfunctioning solenoid valve
• Control board fault
• Wiring error to the solenoid valves
• System pressure irregularity

Click steps to track your progress.

1. 1

   Power cycle the entire HVAC system by turning off its main circuit breaker for a few minutes.

2. 2

   Restore power and observe the system for normal operation.

3. 3

   If the error reappears, it indicates a persistent issue that needs professional diagnosis.

4. 4

   This often requires a qualified HVAC technician to inspect the solenoid valves and control board.

5. 5

   Avoid running the unit if this error persists, as it can lead to component damage.