In many heat pumps, the external fan stops during defrost.
Why it stops
With the fan stopped, the heat directed to the external exchanger is used more for melting ice and less for heating the outside air.
Is it always the same?
No. The strategy varies by manufacturer and model.
What we observe
The fan stopping only during defrost can be completely normal.
Problem
If the fan does not restart after defrost or does not work during heating, then diagnosis is required.
