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Additional heat blocked symbol

Additional heat blocked symbol — Immersion heater is not running

Nibe · F1155 Heat Pumps

What does Additional heat blocked symbol mean?

This symbol appears when the additional heat source, likely the immersion heater, is blocked from operating. This could be due to the selected operating mode, scheduled blocking, or an active alarm.

Common Causes

  • Incorrect operating mode selected.
  • Scheduled blocking of the additional heat.
  • An active alarm preventing the immersion heater from running.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the selected operating mode in menu 4.2.

  2. 2

    Review scheduled blocking settings in menu 4.9.5.

  3. 3

    Check for any active alarms indicated by a red status light or alarm bell icon.

  4. 4

    Reset any active alarms if applicable.

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

Related Faults

AUX output configurationAUX output configured for specific functionAlarm bell iconAlarm bell icon on display — An alarm condition is activeBrine level sensorBrine level monitored by NV 10 accessory
Source: Nibe F1155 Heat Pumps
Open Manual (Page 32)Search more codes in this manual