How to describe an unfamiliar heat-pump noise clearly before you arrange professional support.
Short answer
A new or persistent noise is worth recording because the sound, timing and location can help guide a repair assessment. Describe what you hear without trying to diagnose it yourself, and arrange a visit if the noise is recurring, worsening or accompanied by changed performance.
Describe when the sound happens
Note whether the noise begins at start-up, during a particular mode, in colder weather or only at certain times. A sound that occurs alongside an error message or reduced comfort is especially useful to report.
Identify the general location safely
You may be able to say whether the sound seems to come from the outdoor unit, indoor equipment, pipework area or controller. Do not remove panels or attempt to access internal components to investigate.
Know when to request a repair visit
A repeated, abrupt or unfamiliar sound should be assessed, particularly when it is paired with a performance change. A brief video or written note may help communicate the issue when you make the booking.
No. Systems can make different operational sounds at different times. A new, persistent or concerning change is the reason to request an assessment.
Should I turn the heat pump off if it makes a noise?+
Follow the manufacturer safety guidance for your system. If you are concerned about the sound or see a fault message, seek professional advice rather than investigating internal equipment.