F11 (18 flashes) or F28 (19 flashes) — Compressor position detection circuit fault

What does F11 (18 flashes) / F28 (19 flashes) mean?

These codes mean the system cannot correctly detect the position of the compressor's rotor. This is essential for its operation. It could be due to wiring issues or a damaged compressor.

• Incorrect or poor compressor wiring
• Damaged compressor
• Faulty PCB

Click steps to track your progress.

1. 1

   Turn off the power switch before inspecting connections.

2. 2

   Verify that the compressor wiring is correctly installed and securely connected.

3. 3

   Restart the unit.

4. 4

   If the malfunction persists, the compressor or PCB may be damaged and require professional replacement.