E34 - Abnormally low current or L3 open phase detected in outdoor unit

What does E34 mean?

This error indicates that abnormally low current or no current has been detected by the current transformer (CT) on L3, or an open phase on L3's secondary side of the contactor.

• Loss of power on the L3 phase.
• Faulty current transformer (CT) on L3.
• Loose or disconnected L3 wiring on the secondary side of the contactor.
• Compressor not drawing sufficient current.

Click steps to track your progress.

1. 1

   Turn off the main power supply to the air conditioning system at the circuit breaker.

2. 2

   Have a qualified electrician inspect the L3 phase wiring, the current transformer (CT), and the contactor in the outdoor unit.

3. 3

   Check for any loose connections or damaged wiring.

4. 4

   Restore power only after the professional has diagnosed and corrected the electrical issue.