Why is My Espresso Machine's Pump Making Loud Noises?

Normally, a vibratory pump makes humming or buzzing or gets louder during extraction, while a rotary pump has a low hum and a more consistent sound. If your machine makes sounds not mentioned above, it's time to address the issue.

A noisy pump not only disrupts the calm atmosphere of your coffee shop or bothers you in the quiet of your home, but it can also affect your machine's performance and the quality of your coffee. Tackle them promptly by knowing their common causes and how to deal with each.

Common Causes of Loud Pump Noises

Loud pump noises in your espresso machine can be caused by several issues. Each subtopic below explores a different potential cause for the disruptive sounds caused by the pump parts and their respective fixes. If none of the solutions below worked, it's probably time to replace your pump system or take it to a professional.

Air in the Pump or Water Lines

When air gets trapped in the pump or the water lines, it can disrupt water flow. This often results in a sputtering noise.

Air can enter the system during refilling or if there is a leak. To fix this, you can bleed the system by letting water run through until it flows smoothly.

Scale Buildup

Over time, hard water can leave mineral deposits inside your espresso machine. These deposits can cause blockages and increase pressure on the pump, leading to loud noises.

Regular descaling helps remove these deposits. Check the manufacturer's guide for the recommended descaling process for your machine.

Worn Out or Damaged Components

Parts of your machine can wear out with use. This includes the pump itself and other components like the solenoid valve.

If these parts are damaged or not working properly, they can make grinding or buzzing sounds. Inspect these parts for wear and tear and consider replacing them if they're damaged.

Insufficient Water Pressure

If the water coming into espresso machines is too low, the pump will struggle and make noise. Check that the water valve is fully open and your building's water supply is working right. Also, look at the pump settings and adjust as necessary.

Pump Vibration

A wobbly or unsecured machine pump can vibrate a lot, causing loud sounds. Make sure your coffee machine sits on a flat, even surface and the pump is tightly in place.

Blocked or Damaged Shower Screen

A clogged or broken shower screen makes it hard for water to flow through. The pump then has to work overtime, which gets noisy. Clean the screen often and replace it if needed.

Wrong Pump Pressure Setting

When the pump is cranked to high pressure, it strains and gets loud. Check your machine's manual or ask a pro to help set the pressure just right.

Broken Pressure Relief Valve

This valve lets out extra pressure. If it's not doing its job, the pump builds up too much pressure and makes a racket. Have a technician take a look and put in a new valve if required.

Foreign Objects in the System

Little bits like coffee grounds can sneak in and clog up the works. This bogs down the water pump and turns up the volume. Keep things clean to stop this from happening.