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524

Com. flt PCA Acc. HTS 2 524 — Communication fault with accessory AA34.2

Nibe · Air Conditioning

What does 524 mean?

Communication with accessory AA34.2 has been missing for 15 seconds. A manual reset is required. Check the minimum calculated cooling supply setting.

Common Causes

  • Check the minimum calculated cooling supply is set to 18° C if AA34.2 is the con- trolling accessory for cooling
  • Communication with AA34.2 has been missing for 15 seconds

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Perform a manual reset.

  2. 2

    Verify the minimum calculated cooling supply is set to 18°C if AA34.2 is the controlling accessory.

  3. 3

    Check the communication cable to accessory AA34.2.

  4. 4

    Restart the system.

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

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Source: Nibe Air Conditioning
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