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Why Is My Refrigerator Making a Clicking Noise?

Updated August 16, 20263 min readTime needed: 10–15 minutes to diagnose
See all Refrigerators guides

Short answer: A single click every so often, followed by the compressor humming normally, is just the start relay doing its job. Repeated clicking every few seconds without the compressor ever starting usually means the start relay or compressor itself is failing.

Timing the pattern is more useful than just listening for a click. A normal compressor cycle clicks once as it starts, and again, once, several minutes to hours later as it stops — long, quiet gaps in between are expected. A relay or compressor problem sounds rhythmic instead: a click every few seconds, repeating in a steady loop, with the compressor never actually settling into its usual hum. If you can count roughly how many seconds pass between clicks and whether that gap stays consistent, you'll know within a couple of minutes which pattern you're dealing with — no need to wait and see if the fridge eventually stops cooling to find out.

Common Symptoms

  • A clicking sound coming from the back or bottom of the fridge
  • Clicking repeats every few seconds without the compressor starting up
  • The fridge isn't cooling as well as usual alongside the clicking
  • Clicking is louder or more frequent than it used to be

Step-by-Step Solution

  1. 1

    Time the clicking pattern

    Listen for several minutes — a single click followed by a steady hum is the compressor starting normally. Repeated clicking every few seconds with no hum points to a start failure.

  2. 2

    Check cooling performance

    Confirm whether the fridge and freezer are still reaching normal temperatures — reduced cooling alongside clicking supports a relay or compressor issue.

  3. 3

    Rule out ice-related fan noise

    If accessible, check the freezer's rear panel for frost buildup that could be catching the evaporator fan (see our guide on cooling problems for a manual defrost procedure).

  4. 4

    Have the relay tested if clicking is abnormal

    A failing start relay is a relatively inexpensive, well-defined part — a technician can test and replace it without needing to touch the sealed refrigerant system.

Likely Causes

1. Normal compressor start relay (single click)

A single click as the compressor starts or stops a normal cooling cycle is completely normal and not a fault — it's the relay engaging.

2. Failing start relay (repeated clicking)

If the relay repeatedly tries and fails to start the compressor, you'll hear a rhythmic clicking every few seconds without the compressor ever successfully starting.

3. Failing compressor

If the relay is fine but the compressor itself has a fault (seized or shorted windings), the relay will still repeatedly try and fail to start it, sounding similar to a relay issue.

4. Ice buildup against the evaporator fan

Less commonly, a clicking or ticking can come from a fan blade intermittently catching on ice buildup rather than the compressor circuit at all.

Safe Checks You Can Do

  • Listen for whether the clicking is a single event followed by a quiet hum (normal) or a rapid repeating click with no hum (likely a fault).
  • Check whether the fridge is still cooling normally — a fault-related clicking is often paired with reduced cooling.
  • Check the back panel of the freezer for visible frost or ice buildup that could be catching a fan blade.
  • Unplug the fridge before doing any closer inspection, and move perishable food to a cooler if you'll be more than an hour.

When to Call a Professional

  • Clicking repeats every few seconds with no compressor hum ever starting.
  • The fridge has stopped cooling or cooling has clearly worsened alongside the clicking.
  • You suspect the compressor itself may be at fault — this needs a licensed appliance technician, not a DIY fix.
  • The clicking is accompanied by a burning smell.

Frequently Asked Questions

Is any clicking from my fridge normal?

Yes — a single click as the compressor's start relay engages, followed by a quiet hum, is completely normal and happens every time the compressor cycles on.

Can a bad start relay be replaced without replacing the whole compressor?

In most cases yes — the start relay is a separate, inexpensive component. Only if the compressor itself has failed (not just the relay) would compressor replacement be needed, which is a bigger repair.

How can I tell if it's the relay or the compressor itself?

This distinction usually needs an appliance technician with testing equipment, since both produce a similar repeated-clicking symptom from the outside — don't assume which one it is before getting it checked.

What Not to Do

  • Don't ignore repeated clicking that's paired with warming food — this can mean the compressor has already stopped cooling effectively.
  • Don't attempt to open the sealed refrigerant system yourself under any circumstances — this requires EPA-certified handling.
  • Don't unplug and replug the fridge repeatedly hoping it 'resets' a failing relay — this doesn't fix a hardware fault and can stress the compressor further.

Safety warning

Never attempt to service the sealed refrigerant system, compressor, or its electrical components yourself. If you smell burning or see scorch marks near the compressor, unplug the unit and contact a licensed technician.

Home Solutions Editorial Team

Updated August 16, 2026. How we write guides

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