No Water Flow From an Espresso Machine
No flow means little or no water exits the espresso-machine group when brewing is activated. The cause can be as simple as an empty reservoir or closed water valve, but it can also involve a pump, solenoid, clogged restrictor, scale buildup, or electrical/control problem.
Start with the water supply
For reservoir machines, confirm that the tank contains water, is fully seated, and that any float or level sensor is working normally. For plumbed machines, verify the shutoff valve is open and that incoming water is actually reaching the machine. A clogged or exhausted water-treatment cartridge can also severely restrict flow.
Listen to what the machine does
If the pump runs but no water exits, the machine may have lost prime, a valve may not be opening, or the hydraulic path may be blocked. If the pump is completely silent, the issue could instead involve a switch, control board, safety interlock, reservoir sensor, or power to the pump.
Possible hydraulic restrictions
- Scale in jets, valves, tubing, or the group
- Blocked shower screen or dispersion components
- Stuck or failed solenoid valve
- Restricted inlet filter
- Pinched or incorrectly routed hose
- Pump unable to prime or build flow
Scale-related problems are more likely when water treatment has been neglected. See our published guide to limescale in espresso machines.
Do not confuse no flow with a choked puck
If water flows normally with the portafilter removed but espresso will not pass through the coffee, the machine itself may be fine. The grind could be too fine, dose too high, basket blocked, or puck resistance excessive.
When to stop troubleshooting
Internal electrical diagnosis, energized testing, boiler work, or disassembly of pressurized components should be handled by a qualified technician. Unplug the machine and follow manufacturer service instructions before opening panels.
Browse home espresso machines or return to the coffee glossary for more troubleshooting terms.