Low or a lack of ventilation
႑
Filter blocked.
႑
Clean or replace filter (see page 21).
႑
Exhaust air device blocked or throttled down too much.
႑
Check and clean the exhaust air devices (see page 21).
႑
Fan speed in reduced mode.
႑
Enter menu 1.2 and select “normal".
႑
External switch for changing the fan speed activated.
႑
Check any external switches.
High or distracting ventilation
႑
The ventilation is not adjusted.
႑
Order ventilation adjustment.
႑
Fan speed in forced mode.
႑
Enter menu 1.2 and select “normal".
႑
External switch for changing the fan speed activated.
႑
Check any external switches.
႑
Filter blocked.
႑
Clean or replace the filter.
The compressor does not start
႑
There is no heating requirement.
႑
The heat pump does not call on heating nor hot water.
႑
The heat pump defrosts.
႑
Minimum time between compressor starts has not been reached.
႑
Wait 30 minutes and check if the compressor has started.
႑
Alarm tripped.
႑
Follow the display instructions.
77NIBE™ F750Chapter 4 | Disturbances in comfort
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