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Load monitor active

Load monitor controlling electrical addition

Nibe · F1155 Heat Pumps

What does Load monitor active mean?

The heat pump has integrated load monitors to manage the electrical addition's power usage. It redistributes power or disengages the addition if the property's main fuse risks tripping due to overload.

Common Causes

  • High power consumption from other appliances
  • Electrical addition is operating
  • Property's main fuse is close to its limit

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check if the property's main fuse is set correctly in menu 5.1.12.

  2. 2

    Ensure current sensors are correctly installed on each incoming phase conductor and connected to AA3:X4.

  3. 3

    The system will automatically redistribute power or disengage the electrical addition during overload.

  4. 4

    Reconnection occurs when other power consumption is reduced.

Browse all codes in this manual (27)
Verified technical data. Last updated: April 2026

Related Faults

AUX output configurationAUX output configured for specific functionAdditional heat blocked symbolAdditional heat blocked symbol — Immersion heater is not runningAlarm bell iconAlarm bell icon on display — An alarm condition is active
Source: Nibe F1155 Heat Pumps
Open Manual (Page 23)Search more codes in this manual