F11 — 4-way valve switching abnormality

What does F11 mean?

The 4-way valve is having trouble switching states. This has occurred multiple times within a short period, affecting heating/cooling reversal.

• Faulty 4-way valve
• Loose or damaged lead wire/connector to the 4-way valve

Click steps to track your progress.

1. 1

   Check the lead wire and connector of the 4-way valve.

2. 2

   Listen for any unusual noises from the 4-way valve during operation.

3. 3

   If the valve appears to be stuck or unresponsive, it may need replacement.