Warning Z1 Undervoltage at power supply — Incoming AC voltage too low

What does 5347 mean?

This warning indicates that the incoming AC voltage to the inverter has dropped below 165 V for 10 seconds, or below 180 V for 0.5 seconds. The warning resets automatically after 2 minutes if voltage returns above 190 V.

• Bad connection in mains voltage to either the indoor or outdoor unit.
• Low incoming mains voltage to the unit.
• Low incoming mains voltage to the installer module.

Click steps to track your progress.

1. 1

   Check the main supply voltage connections to both the indoor and outdoor units for secure fit.

2. 2

   If undervoltage warnings are repeated frequently, contact your electricity supplier to report low incoming mains voltage.

3. 3

   Ensure all electrical connections are clean and free from corrosion.