Nibe · SHB 20
This symbol indicates that the additional heat source in the system is blocked from operating, typically due to mode selection, scheduling, or alarms.
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Check the selected operating mode in menu 4.2.
Review scheduled blocking settings in menu 4.9.5.
Check the alarm log in menu 3 for any active alarms that might be causing the blockage.
If necessary, reset alarms or adjust settings to allow additional heat operation.