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511

No comm. with in- verter for five days 511 — No communication with inverter

Nibe · Air Conditioning

What does 511 mean?

There has been no communication with the inverter for five days. Check the installation and ensure there has been communication for at least 60 seconds for automatic reset.

Common Causes

  • Check the installation
  • No communication with the inverter for five days

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the inverter installation is correct.

  2. 2

    Check all communication cables between the unit and the inverter.

  3. 3

    Ensure the inverter is powered on.

  4. 4

    Restart the system and confirm communication is established for 60 seconds.

Browse all codes in this manual (95)
Verified technical data. Last updated: April 2026

Related Faults

107Sensor flt: BT7 HW sens top 107 — Sensor fault: Hot water sensor151Sen flt: CL11- BT51 pool temp sensor 151 — Sensor fault: Pool temperature sensor152Sen flt: CL12- BT51 pool temper- ature sensor 152 — Sensor fault: Pool temperature sensor
Source: Nibe Air Conditioning
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