Fellow Aiden descale: complete all three phases and clear a repeating alert
Aiden records completion only when all three phases finish close together.
Before you start
- ✓Allow about 40 minutes and stay near the machine between phases.
- ✓Back up custom profiles before any factory reset.
Checks to run in order
Aiden
- 01
Identify the exact version
Start with the recommended liquid descaler and complete the first approximately 16-minute phase.
✓ After this stepThe model and controls match this guide. - 02
Run the safe check
Complete both following ten-minute rinse phases, leaving no more than five minutes between them.
✓ After this stepNo part was forced and no casing was opened. - 03
Complete the official sequence
If the message remains after a truly complete cycle, back up profiles before the manufacturer reset procedure.
✓ After this stepThe machine returns to its normal ready state; otherwise use the stop rule.
Compatible maintenance products
These products are shown only when a matching diagnosis step can use them. Confirm the full machine reference before ordering.

Fellow Descaling Concentrate
Fellow Descaling ConcentrateMade for this machine reference according to the manufacturer.
View the compatible product ↗View the machine and its accessories
Manufacturer instructions used
Official manufacturer source
FAQ · Fellow Aiden
Why does Aiden ask to descale again?
The three phases may not have been completed close enough together. Finish the 16-, 10- and 10-minute stages and answer each refill prompt within five minutes.
Can I use powdered descaler in Aiden?
Fellow recommends a high-quality biodegradable, phosphate-free liquid coffee-machine descaler. Use the stated liquid concentration rather than improvising.