E203 — Communication error between indoor and outdoor units

What does E203 mean?

This error indicates a problem with the communication connection or power supply between your indoor and outdoor air conditioning units. It can prevent the system from operating correctly.

• Loose or incorrect communication wiring (F1: Red, F2: Blue).
• Improper power connections (1(L), 2(N)).
• Faulty communication circuit on the main control board of the outdoor unit.

Click steps to track your progress.

1. 1

   Turn off the air conditioner at the main power switch or circuit breaker and wait at least 30 seconds.

2. 2

   Turn the power back on and see if the error clears.

3. 3

   Check that all communication cables between the indoor and outdoor units are correctly and securely connected, specifically F1 (Red) and F2 (Blue).

4. 4

   Ensure the power connections (1(L), 2(N)) are also securely connected.

5. 5

   If the error persists after checking connections and power cycling, contact customer support for further assistance.