E30 - Indoor/outdoor unit connected error

What does E30 mean?

This code indicates a problem with the connection or communication between the indoor and outdoor units.

• Loose or damaged communication wiring between units.
• Incorrect wiring during installation.
• Electromagnetic interference.
• Faulty control board in either the indoor or outdoor unit.

Click steps to track your progress.

1. 1

   Turn off the main power to the entire AC system at the circuit breaker for 5 minutes, then restore power.

2. 2

   Have a qualified technician inspect the communication wiring between the indoor and outdoor units for secure connections and damage.

3. 3

   Ensure that the wiring follows the correct diagram for your specific model.

4. 4

   If wiring is confirmed good, a technician will need to check the control boards.