E11 — I/O PCB Communication Abnormality

What does E11 mean?

This error indicates that the communication signal from the I/O (Input/Output) board cannot be received for 2 minutes, suggesting a problem with the board or its connection.

• Loose or damaged communication wiring to the I/O PCB.
• A faulty I/O PCB.
• Interference affecting the communication signal.

Click steps to track your progress.

1. 1

   Turn off the main power to the Haier unit at the circuit breaker.

2. 2

   Wait for at least 30 seconds.

3. 3

   Restore power to the unit and observe if the error clears.

4. 4

   If the error persists, contact a qualified service technician to check the I/O PCB connections and the board itself.