Common repairs and diagnostics
The most frequent espresso machine repair issues, how to diagnose them, and best practices for resolving them safely.
- Coffee Basics Nerds
- 2 min read
Common Issues and Diagnostics
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Leaking Grouphead:
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Cause: Worn gasket or dirty group.
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Diagnosis: Water leaks around portafilter during extraction.
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Fix: Replace gasket, clean shower screen.
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Low or No Pressure:
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Cause: Pump failure, scale blockage, or channeling puck.
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Diagnosis: Check manometer reading; if system pressure is low, pump or blockage likely.
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Fix: Descale, clean lines, or replace pump.
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Inconsistent Temperature:
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Cause: Faulty thermostat, PID sensor issues, or scale buildup.
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Diagnosis: Shots taste variable; use thermometer to confirm grouphead temp.
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Fix: Replace sensor or descale boiler.
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Steam Wand Weak or Blocked:
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Cause: Blocked tip holes, scale in steam circuit.
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Diagnosis: Weak steam pressure, sputtering.
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Fix: Soak wand tip in detergent, descale steam boiler if needed.
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No Water Flow to Group:
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Cause: Solenoid valve stuck, clogged line.
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Diagnosis: Pump runs but no flow.
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Fix: Clean or replace solenoid, flush lines.
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Unusual Noises:
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Vibrating pump noise normal, but grinding or hissing may indicate blockages or airlocks.
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Fix: Purge air, check for blockages, inspect pump mounts.
Preventive Maintenance
- Regular backflushing and gasket replacement.
- Scheduled descaling and water filtration.
- Cleaning steam wand and replacing tips as needed.
- Inspecting electronics and replacing worn switches or relays.
When to Call a Technician
- Electrical issues (heating elements, wiring).
- Boiler leaks or pressure vessel problems.
- Control board failures.
Summary
Espresso machines most often require repairs for leaks, pressure loss, temperature instability, or blocked steam wands. Systematic diagnostics—guided by manometers, flow meters, and taste—help identify causes. Preventive maintenance reduces breakdowns, but complex issues should be handled by qualified technicians.