Seeing frost or ice on your heat pump? Learn the difference between normal winter frost and signs of a developing fault. This expert UK guide explains defrost cycles, common causes of excessive icing, efficiency impacts, and when to call a professional.

A heat pump entering defrost mode is normal during cold UK weather, but getting stuck in defrost mode is not. This guide explains what causes repeated or continuous defrost cycles, how long defrost should last, common faults, DIY checks, and when professional repair is required.