Ascaso
Excessive Brew Pressure or Flow Restriction
Over-extracted coffee: Shots are very slow or choke the machine, with a bitter taste.
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Possible Causes
OPV set too high, blocked group jet or restrictor, excessively fine grind or overdosing, scale buildup in group passages
How to Fix / Troubleshooting
Barista adjustments:
- Coarsen grind: Adjust the grinder to a slightly coarser setting and reduce the dose if necessary.
- Clean group: Remove and clean the shower screen and dispersion plate. Backflush with detergent.
Technical checks:
- Inspect group jet: Some Ascaso models have a small jet or restrictor in the group. Remove and clean it if partially blocked.
- Check OPV: Measure brew pressure with a gauge. If above spec, adjust or replace the OPV.
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Repair Difficulty
Easy
2/5
Required Part
Group Jet / Overpressure Valve
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