Panels, guards, pipes, or mounting bolts have loosened. The compressor vibrates and the loose parts rattle, buzz, or clang.

What you'll see

Rattling, buzzing, or intermittent clanging that may change with compressor speed or load. The noise is often from enclosure panels, piping supports, or guard covers. It can sound alarming but is usually harmless -- just annoying and unprofessional.
Before you assume this is the problem

Make sure the noise isn't from a failing bearing, belt, or coupling before dismissing it as 'just a rattle'. Listen carefully and isolate the source.

See all causes of unusual noise →

How to diagnose

  1. Touch test while running

    With the compressor running (carefully, away from moving parts), lightly touch panels, guards, pipes, and brackets one at a time. When you touch the vibrating part, the noise will change or stop. That's your culprit.

    Result: Noise changes when touching a component = that's the loose part.

How to fix it

  1. Tighten, secure, or add damping

    Tighten mounting bolts, secure loose panels, add rubber damping pads where metal contacts metal. For piping resonance, add a support bracket or change the pipe run to alter the resonant frequency.

Common mistakes

Don't ignore new noises. While loose panels are harmless, they can mask the sound of a real problem developing (bearing wear, coupling failure). Investigate any new noise.

Parts & tools

Basic hand tools for tightening. Rubber damping pads. Pipe supports if needed.

Review safety precautions before starting →