H2O Rancilio — Water Main Pressure Below Threshold / No Water Supply
At a glance
- Severity
- WARNING THEN STOP
- Domain
- ESPRESSO_MACHINE_SYSTEM
- Reference standard
- UNI 9182 (Water installations) / EN 1717 (Backflow protection)
- Product / context
- No water in the reservoir (Silvia Pro X)
What it means
The mains water pressure is below the minimum threshold required by the machine: slow filling, pressure alarms or irregular dispensing. Required pressure: minimum 1.5 bar, optimum 2-4 bar, maximum 6 bar.
Probable causes
- Insufficient pressure from the premises plumbing.
- Supply valve partially closed or inlet filter clogged.
- Failed or miscalibrated pressure reducer.
- Empty internal tank on machines not connected to the mains.
Reference values
| pressione acqua bar | {"minimo":1.5,"ottimale":"2-4","massimo":6,"nota":"Below 1.5 bar slow filling and pressure alarms; above 6 bar install a pressure reducer."} |
|---|
Where to start
Disconnect the water inlet hose from the machine and open the valve into a bucket: is the pressure adequate (minimum 1.5 bar, optimum 2-4 bar)?
Full guided diagnosis in the app
The diagnostic tree for this fault has 3 guided steps with measurements, checks and resolutions. You'll find it in HorecaIQ, one of the four IndexOS apps: free, works offline.
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The same fault on other brands
More Rancilio codes
- E00/E128/E129 — Board Communication Fault / External Boards Not Responding
- E02 / E05 — Boiler Heating Timeout / Temperature or Pressure Not Reached
- E03/E04 — Espresso Boiler/Group Probe Fault — Short Circuit or Open Circuit
- E06 — Water Softener Exhausted / Scale Buildup in Boilers
- E09-E15 — Internal Power Supply Missing or Short Circuit (5 V / 12 V / 24 V)
- E19 — Boiler Overpressure / Safety Valve Release
- E20 / E03 — Boiler Safety Level Intervention
- W01 — Group Head Dispensing Timeout / Flowmeter Error