Heat pump short cycling occurs when a heat pump repeatedly turns on and off before completing a normal heating or cooling cycle. This guide explains the most common causes, including thermostat issues, oversized systems, airflow restrictions, refrigerant imbalances, and control faults. Learn how engineers diagnose short cycling, what symptoms to watch for, and the steps that can help restore efficient, reliable operation.

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.