The anti-scale light on my steam generator stays on after descaling
Home Nura guide — category Irons & Steam Generators
Diagnosis
A steam generator's anti-scale light often stays on after descaling because the maintenance counter was not reset, or because the boiler still holds scale or descaler residue. Rinse thoroughly, then follow the reset procedure in the manual.
Possible causes
- Maintenance counter not reset — the reminder relies on a counter that stays lit until it is deliberately reset.
- Incomplete descaling — scale remains in the boiler and the appliance keeps signalling that maintenance is needed.
- Insufficient rinsing — descaler residue is left in the boiler and can keep the alert on or affect steam output.
- Worn anti-scale cartridge or cassette — the built-in filter is saturated and no longer protects the unit.
Recommended procedure
- 1Unplug the unit, let it cool completely and never unscrew the boiler cap while it is hot or under pressure.
- 2Re-read the manual's descaling procedure: approved product, dosage, soaking time and the recommended number of rinse cycles.
- 3Rinse the boiler several times with clean water by filling, swirling and emptying it until no residue comes out.
- 4Repeat a full descale if scale-laden water still drains out, then rinse again before putting the appliance back into use.
- 5Reset the light as the manual describes, often by holding a button, and replace the anti-scale cartridge if your model has one.
Repair or replace?
If the light stays on after careful descaling and a reset, or the boiler is heavily scaled, repair is costly. On an older unit used with very hard water, replacing it is often the better choice.
Other common failures on this category
These incidents affect the same type of appliance — diagnosis and recommended procedure for each.
- Irons & Steam GeneratorsMy steam generator iron spits water onto the laundry
- Irons & Steam GeneratorsThe soleplate of my iron keeps snagging the fabric
- Irons & Steam GeneratorsMy steam generator iron spits brown drops that stain clothes
- Irons & Steam GeneratorsThe soleplate of my steam generator iron sticks to fabric and leaves shiny marks
Frequently asked questions
In Europe, any irons & steam generators bought new from an official reseller benefits from a legal conformity guarantee of at least two years (Directive (EU) 2019/771). This guarantee covers defects present at delivery, whenever they first manifest.
You can pick: European law puts the legal guarantee on the seller, not the manufacturer. In practice, a store return is usually faster, but the manufacturer can repair if the damage is out of warranty. Keep proof of purchase.
Our public methodology adds a Nura Score /10 penalty to any irons & steam generators whose recurring failures are documented in European user feedback. A model that breaks too often never tops our charts, brand notwithstanding.
Yes, within the limits of the European "right to repair": routine maintenance tasks (cleaning, gasket replacement, calibration) never void the legal warranty. Only irreversible hardware modifications can be a problem. For a irons & steam generators, any handling documented in the manufacturer's manual stays covered.
The directive imposes a two-year legal conformity guarantee, with a presumption of pre-existing defect during the first twelve months — the burden of proof is on the seller. For a irons & steam generators that breaks in that window, you're entitled to free repair or replacement, no strings attached on typical use.