E202 (Red ON, Green ON, Yellow OFF) — Communication error between Indoor and Outdoor Main PCB

What does E202 mean?

The outdoor unit's PCB LED displays E202 when there is no proper communication between the indoor unit and the outdoor unit's main control board. This can prevent the system from operating correctly.

• Loose or faulty electrical connections between units
• Incorrect communication settings
• Interference on the communication line

Click steps to track your progress.

1. 1

   Turn off the main power to both the indoor and outdoor units at the circuit breaker.

2. 2

   Carefully check all communication cable connections between the indoor and outdoor units to ensure they are secure and correctly wired.

3. 3

   Wait for at least 30 seconds, then restore power to the units.

4. 4

   If the error reoccurs, contact a qualified technician to diagnose the electrical connections and settings.