Rancilio Classe 20 (ASB, USB, DE)
Multi-boiler espresso machine with touch display. E codes are faults that stop the machine; W codes are warnings about one part, so the rest keeps working.
What it is: Espresso machine
Rancilio Classe 20 (ASB, USB, DE) error codes
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E01 | Boiler did not fill in time | Water supply off or fill valve fault | Open the water; check the fill valve. |
| E02 | Boiler pressure not reached | Element, relay or pressure sensor | Check heating and sensor. |
| E03 / E04 | Boiler level probe shorted / open | Probe or wiring | Check the probe. |
| E05 | IDS link missing | Lost connection to the IDS unit | Check the cable. |
| E06 | Softener resin regeneration failed | Regeneration did not finish | Rerun regeneration. |
| E07 | Maintenance failure | Service interval passed | Service the machine. |
| E08 | Washing failure | Cleaning cycle did not finish | Rerun cleaning. |
| E09 / E11 | 5 V / 12 V service supply missing | Power board or wiring | Check the supplies. |
| E10 | Pressure transducer not connected | Sensor or cable | Check the connection. |
| E12 | 12 V power board link missing | Board or wiring | Check the connection. |
| E13 / E14 / E15 | 24 V to valves / display / triacs missing | Supply or wiring | Check the 24 V circuits. |
| E19 | Boiler over-pressure | Pressure control or relay stuck | Switch off; check the pressure control. |
| E20 | Boiler safety level triggered | Water level too low or high | Check the level probe and fill. |
| W01–W03 | Group 1–3 flow meter not read | Grind too fine or flow meter fault | Coarsen the grind; check the flow meter. |
| W08 | Maintenance due | Counter reached | Book a service. |
| W20–W49 | A solenoid valve circuit open or shorted (fill, drain, groups, steam, economiser, profiling) | Coil or wiring | Check the valve named on screen. |
| W70–W75 | Group 1–3 lighting open or shorted | LED or wiring | Check the light. |
| W92 / W93 | Cup warmer probe open / shorted | Probe | Check the probe. |
| W96–W101 | Group 1–3 outer temperature probe open / shorted | Probe | Check the probe. |
| W149–W153 | Group inner probe over-temperature or set point not reached | Heater, probe or control | Check the group heater and probe. |
Notes
- The error history and counters can be copied to a USB stick from the technician menu.
- The W list continues past W200 for more valve lines; the screen names the part.
For licensed technicians only. This equipment can involve mains voltage, high-voltage microwave circuits, gas and refrigerant. Isolate power (and gas) before opening panels, follow the manufacturer's manual and your local licensing rules (for example ARC refrigerant handling and electrical or gas licences). Wrong settings can spoil food or damage equipment. Check every value on the unit in front of you before changing it.
Based on: Rancilio Classe 20 user manual (2020-07), list of errors. Always check the manual for your exact model and software version.
ServiceModes is not affiliated with Rancilio or any other manufacturer. Written in our own words from the manufacturer's documentation.