Noisy Outdoor Air Conditioning Unit
Rattling, humming or vibration from the outdoor condenser, sometimes worse at certain speeds..
Rattling, humming or vibration from the outdoor condenser, sometimes worse at certain speeds.
What is actually going on
Rattling, humming or vibration from the outdoor condenser, sometimes worse at certain speeds.

The realistic causes, in order
Loose panels or fixings, the simplest and most common cause A failing fan bearing or a fan blade that has been struck by debris Compressor mounts that have perished, transmitting vibration into the bracket and wall
What we test on site
Panel fixings and unit mounting, including anti-vibration feet Fan balance and bearing condition Compressor operation and mount condition
What you can safely look at with a noisy outdoor air conditioning unit
- Check nothing has blown into the fan guard
- Note whether the noise happens at start-up only or throughout the run
- Bracket and mounting condition matters for wall-mounted units. A unit that has begun to move on its bracket needs attention before it becomes a safety issue.
Who does the work
- Gas Safe registered engineers — registration 554328
- REFCOM registered for F-Gas refrigerant work
- Worcester Bosch accredited installer
- John The Plumb Ltd, company registration 10026483
Get a noisy outdoor air conditioning unit diagnosed properly
Fixings, mounts and fan work are all routine; the important step is identifying which one it is rather than guessing.
Questions we get asked
Why is a noisy outdoor air conditioning unit happening on an air conditioning system?
Loose panels or fixings, the simplest and most common cause
What normally puts a noisy outdoor air conditioning unit right?
Fixings, mounts and fan work are all routine; the important step is identifying which one it is rather than guessing.
Is it safe to keep using the system with a noisy outdoor air conditioning unit?
Bracket and mounting condition matters for wall-mounted units. A unit that has begun to move on its bracket needs attention before it becomes a safety issue.
