Error 181 - Simultaneous opening of cooling/heating MCU SOL V/V (2nd detection)

What does 181 mean?

Both cooling and heating solenoid valves in the MCU (Microcontroller Unit) are detected as open simultaneously. This is a persistent issue (second detection).

• Faulty solenoid valves
• Control board malfunction
• Wiring error to the solenoid valves

Click steps to track your progress.

1. 1

   Power cycle the unit to reset the control system and attempt to clear the error.

2. 2

   Check the wiring to the cooling and heating solenoid valves for any loose or damaged connections.

3. 3

   If the error persists, contact a qualified technician as it may indicate a faulty valve or control board.