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

What does 181 mean?

This is the second detection of an error where both the cooling and heating solenoid valves are open at the same time. This indicates a persistent problem.

• Stuck or faulty solenoid valves
• Persistent control system malfunction
• Wiring problems to the valves

Click steps to track your progress.

1. 1

   Re-inspect the cooling and heating solenoid valves for proper function.

2. 2

   Ensure wiring to the valves is secure and undamaged.

3. 3

   Check the MCU's ability to independently control each valve.

4. 4

   A service technician should address this recurring error.