Use fresh beans and grind just before brewing to reduce CO2 bursts.
- Clean the portafilter, basket, and group head regularly to prevent clogs.
- Descale every few months to maintain water flow.
- Call a pro for pump or boiler issues instead of DIY repairs.
Why does my espresso machine splutter?
Spluttering happens when water can't flow evenly through the coffee. The most common cause is stale or over-roasted beans. They produce excessive CO2, which bursts through the puck. A blocked portafilter basket or a clogged group head also forces water to sputter. Low water level in the boiler creates steam pockets. Finally, a worn pump or pressure issues can cause irregular flow.
How to fix a spluttering espresso machine
Start with the coffee. Use beans roasted within the last two weeks and grind them just before brewing. Clean the portafilter and basket with hot water and a brush. Remove any old coffee residue. Purge the group head by running water without the portafilter for a few seconds. If spluttering continues, descale the machine with a citric acid solution. Check the water level and refill if low. Inspect the group gasket for wear and replace it if cracked.
How to prevent spluttering in the future
Buy whole beans in small batches and store them in an airtight container. Grind only what you need for each shot. Keep your portafilter and basket clean after every use. Backflush your machine weekly if it has a three-way valve. Use filtered water to reduce scale buildup. Schedule a descaling every three months, depending on water hardness.
When to replace parts or call a professional
If cleaning and fresh coffee don't stop the splutter, the pump may be failing. Listen for a loud, uneven buzzing during extraction. A worn pump usually needs replacement by a technician. Persistent steam bursts can also indicate a faulty pressure stat or boiler issue. These repairs require professional tools and safety knowledge. If your machine is over five years old and parts are hard to find, consider replacing it.