The Nuova Simonelli Aurelia has a built-in cleaning cycle, but it won’t do the full job on its own. Group head backflushing, drain tray maintenance, and volumetric reset each require separate steps, and skipping any of them is the fastest way to end up with bitter shots or a service call.
Backflushing the Group Heads
The Aurelia uses Nuova Simonelli’s own proprietary group head design across all model variants (Aurelia I, II, and Wave). You backflush with a blind basket and espresso machine cleaner (Cafiza or equivalent). The Aurelia II and Wave have an automatic cleaning cycle accessible from the display, but that cycle still needs you to insert the blind basket and add cleaner manually.
Steps for a manual backflush cycle:
- Insert the blind basket into the portafilter and add a small dose of espresso machine detergent (follow the detergent manufacturer’s dosing recommendation, usually around 1 gram per group).
- Lock the portafilter in and run a 10-second brew cycle, then let it soak for 5 seconds with the pump off. Repeat 5 to 8 times.
- Remove the detergent, rinse the portafilter thoroughly, and run 3 to 4 clean water cycles through the group to flush residue.
- Pull a short shot of plain water and discard it before making any drinks.
Do this daily at close if you’re running a busy bar. Weekly is fine for lower-volume setups, but daily is better. The Aurelia Wave’s automatic clean cycle does this sequence for you once you insert the blind basket, so let it run completely rather than stopping it early.
A few things people miss: the shower screen and group gasket need to come out periodically, usually every week or two depending on volume. Use a group head brush and a small screwdriver or coin to remove the screen. Soak both parts in a detergent solution, scrub, rinse, and reinstall. A worn or cracked gasket is one of the most common causes of leaks around the portafilter. If you’re seeing water seeping out when you lock in, the gasket needs replacing, not more cleaning.
The Drain Tray
The drip tray on the Aurelia is removable and should be emptied and rinsed daily. What people skip is the drain line running from the tray into the machine’s internal drain or direct drain connection. On a busy bar machine, that line accumulates coffee oils and will start to smell or even back up.
Once a week, pull the tray completely and flush the drain connection with hot water. A small flexible brush helps if the line is partially blocked. If your Aurelia drains into a plumbed waste connection, check that the line isn’t kinked or clogged at the connection point. Slow drainage during a cleaning cycle often points here, not to the group heads.
Volumetric Reset
The Aurelia is a volumetric machine, meaning each button programs a specific dose by volume. Over time, especially after cleaning cycles or if someone has accidentally changed a setting, your doses can drift.
The reprogram procedure varies by model. On many Aurelia Wave Volumetric models, pressing and holding the button while the pump runs, then pressing it again to stop, saves the new dose. On the Aurelia II, you enter a programming mode through a separate key sequence and menu. Check your specific manual for the right procedure, since it differs between variants and firmware versions.
After any deep cleaning or descaling, reprogram your doses. If shots are running long or short right after a cleaning cycle, the volumetric system may need to be re-calibrated once flow stabilizes.
Descaling
Hard water is the real enemy of any espresso machine, and the Bay Area has moderately hard water in most municipal supplies. The Aurelia uses a boiler system that will build up scale internally over time. The T3 variant uses multiple boilers with independent temperature control per group. Regardless of configuration, scale buildup affects temperature stability and shortens boiler life.
Descaling frequency depends on your water hardness and whether you’re using filtered water. If you’re not already running the machine through a water softener or carbon filter on the incoming line, that’s worth looking at. Internal boiler descaling requires partial disassembly on most Aurelia configurations, so it’s a tech job unless you’re comfortable with the process. A softener filter prevents most of the buildup in the first place.
When to Call a Tech
Backflushing, tray cleaning, and dose reprogramming are all owner-safe. What isn’t DIY-safe:
- Replacing solenoid valves (the part responsible for pressure release after a shot)
- Replacing group head gaskets (straightforward but requires proper access and reassembly)
- Any boiler work, including descaling the internal boiler or addressing heating element failures
- Pump replacement or adjustment
- Circuit board or display issues
If you’re seeing error codes on the display, pulling the manual and cross-referencing is the right first step, but don’t ignore persistent alerts. Display errors on the Aurelia typically point to temperature sensors, water level probes, or pressure issues, and most of those need a tech to diagnose correctly.
A good rule: if water is going somewhere it shouldn’t, stop using the machine and call. Running a leaking machine damages more than just the part that’s leaking.
Getting a Tech in the Bay Area
Diagnostics can take up to a week; most repairs run 3–4 weeks. That is exactly why we recommend preventive maintenance: a maintained machine does not sit in a repair queue for a month.