Is Your Espresso Machine Trying to Tell You Something? 5 Failures Baristas Can Catch Early

The espresso machine failures that coffee repair shops see most often + small habits baristas can develop to keep them away.

BY ROMAN ABYSOV
BARISTA MAGAZINE ONLINE

Featured photo by Jason Betz

Most café machines that end up on our bench at SoCal Coffee Repair in Whittier, Calif., didn’t die all at once. They warned people for weeks first. A pump that sounded a little rougher than before. Shot times that kept creeping up. A small puddle under the drip tray that nobody had time to chase during the morning rush. When the machine finally quits, the repair is bigger and the downtime hits at the worst possible moment.

Here are the five failures we see most often in commercial espresso machines, what they look and sound like early, and the small habits that keep them away.

1. Scale in the boiler and heat exchanger

Scale is the slow one, and it’s behind more of our repairs than anything else. Early signs: The steam isn’t as strong as it used to be, brew temperature drifts, the element takes longer to recover between drinks, or you see white crust on the steam tip or in the drip tray. By the time a machine starts tripping breakers, the heating element is usually buried in it.

The habit: Know your water. Test hardness with a cheap strip, change the filter cartridge on schedule, and write the change date on the housing with a marker. Most cafés we visit are running cartridges well past their rated capacity. Once scale has built up inside a commercial boiler, getting it out properly means taking the machine apart. It isn’t something you can fix by running a product through it on the counter.

2. Worn group gaskets and shower screens

Watch for water or coffee seeping around the portafilter ears during a shot, a handle that swings further right than it used to before it locks, and shots that channel even when your puck prep is clean.

The habit: Backflush with detergent at close if your machine has a three-way valve, brush the group head between rushes, and pull the screen once a week to soak it. A gasket costs very little. Replace it when the handle starts locking past center, before it starts leaking.

3. Sticky solenoid valves

The three-way solenoid releases pressure from the group after a shot. When it starts to stick, the puck comes out soupy, the group keeps dripping, or the portafilter sprays when you unlock it. A sticky autofill solenoid shows up differently. You’ll see the boiler overfill or water coming out of the steam wand.

The habit is the same as above. Backflush daily and use filtered water. If wet pucks suddenly appear on a machine that always made dry ones, call someone then. Don’t wait for the valve to fail completely on a Saturday.

4. A failing pressurestat

On machines that control the steam boiler with a pressurestat instead of a PID, the switch eventually wears out. Signs include a pressure gauge that swings wider than usual, an element that clicks on and off constantly, buzzing from inside the machine, or the safety valve venting steam.

The habit: Look at the boiler gauge every morning after warm-up. Take a phone photo of where the needle normally sits so everyone on the team knows what normal looks like.

5. Pump wear

Rotary pumps are tough, but they do wear out. They usually get louder first, with a whine or a grinding note. Then brew pressure drops below your usual reading, and shot times stretch out with the same grind setting.

The habit: Never let the pump run dry. Keep the water supply open, check that the inline pre-filter isn’t clogged, and listen for changes. A starved pump wears out much faster than one with a steady supply.

The common thread

Every one of these failures starts with something changing from normal, which means you need to know what normal is. A two-minute opening check makes a big difference: boiler and brew gauge readings, a look under the drip tray, a listen to the pump, and a check that the group stops dripping after the first shot. Write it down. When something shifts, call your tech while it’s still a gasket and not a boiler.

ABOUT THE AUTHOR

Roman Abysov runs SoCal Coffee Repair, an espresso machine and grinder repair shop in Whittier, California, that services home and café machines across Southern California. His team also covers the Bay Area through its sister shop, NorCal Coffee Repair.

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