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Your coffee has started tasting flat, the machine is slower than it was, or a light you don't recognise is blinking at you from the front panel. Nine times out of ten that's limescale rather than a fault.
Descale your Wilfa coffee maker at least every three months, and more often if you live in a hard water area. Run a descaling solution through a full tank with no coffee and no filter paper in place, then rinse it through with two full tanks of clean water. It takes about fifteen minutes.
Every time the machine heats water, a little of the calcium and magnesium dissolved in that water stays behind. It builds up inside the heating element and the pump, which are the two parts you can't see or reach.
Wilfa coffee makers hold water between 92 and 96°C from the first drop to the last, the range the European Coffee Brewing Centre certifies against. Scale insulates the heating element, so the water arrives cooler. Cooler water under-extracts, and under-extracted coffee tastes thin and sour. That's usually the point at which people start blaming their beans.
Left long enough, scale stops being a flavour problem and becomes a mechanical one. A machine that has stopped pumping water almost always has a blocked flow path rather than a broken pump.
Wilfa's guidance is a minimum of every three months. In a hard water area you'll want to do it considerably more often than that.
| Your water | Roughly where | Descale every |
|---|---|---|
| Soft | Scotland, Wales, the North West, Cornwall and Devon | 3 months |
| Moderately hard | Much of the Midlands, the North East, central England | 2-3 months |
| Hard to very hard | London, the South East, East Anglia, Lincolnshire | 4-8 weeks |
Your water supplier publishes a hardness figure for your postcode. Quicker still, look inside your kettle: a chalky white film means hard water, and your coffee maker is collecting the same deposit.
Two things shorten the interval further. Brewing several times a day, and brewing a full 1.25 litres each time. A machine used twice daily passes roughly four times as much water, and four times as much dissolved mineral, as one used every other morning.
They do different jobs, and a machine that's had one and not the other is only half looked after.
| Product | What it removes | Where it works | How often |
|---|---|---|---|
| Brewfresh Universal Descaler | Limescale, the hard mineral deposits | Inside the tank, pump and heating element | Every 3 months, or sooner in hard water |
| Brewfresh Universal Cleaner Concentrate | Coffee oils and stale residue | The filter holder, shower head, carafe and basket | Monthly, or whenever the carafe looks tired |
Coffee oil is why a machine that's been descaled can still produce bitter, slightly rancid coffee. The oils turn on the plastic long before the beans would go stale in the bag, and descaling doesn't touch them.
This works for the Zense and Zense Alux, the Performance Compact, the Performance Thermo, the Svart Performance, the Classic+ and the Precision. Set aside about fifteen minutes.
Wilfa machines use the front button to talk to you, and the pattern matters.
The rest of the front-panel behaviour, along with overflowing filter holders and machines that won't start, is in our guide to nine common Wilfa coffee maker faults.
If the machine needs attention now and there's no Brewfresh in the cupboard, Wilfa documents a white vinegar method for the Classic+. Pour roughly 800ml of warm water and 100ml of white vinegar into the tank, let it stand, then run it through. If the machine won't start because the flow is fully blocked, leave the solution to sit in the tank, empty it upside down over the sink, and repeat. Finish with a full one-litre cycle of clean water and no coffee.
Treat it as a one-off. Vinegar is a weaker descaling acid than a purpose-made solution, it needs far more rinsing, and the smell lingers.
Don't refill the water tank using the coffee carafe. It's the natural thing to do and the one Wilfa specifically warns against, because it puts coffee oils into the clean water side of the machine every single time.
Don't leave brewed coffee sitting on the warming plate either. It won't scale the machine, but it will stew the coffee and bake residue onto the carafe. The plate switches itself off after 40 minutes anyway, and here's why that's deliberate.
Every Wilfa product bought after 1 September 2020 carries a five-year warranty, and there's nothing to register. Your receipt is the warranty certificate.
Damage caused by scale build-up, where descaling hasn't been carried out as the manual instructs, is explicitly excluded from that cover. A pump seized by years of untreated hard water isn't a manufacturing defect and won't be treated as one.
Fifteen minutes, four times a year, keeps the cover intact. The descaler is £9.60, and a replacement water tank or server costs considerably more. You can read the full detail of what the warranty covers here.
At least every three months. In hard water areas, which includes London, the South East and East Anglia, descale every four to eight weeks instead. If you brew more than once a day, shorten the interval further.
Yes, as a one-off. Wilfa documents a method for the Classic+ using roughly 800ml of warm water with 100ml of white vinegar, followed by a full one-litre rinse cycle with clean water. A purpose-made descaler such as Brewfresh Universal Descaler is more effective and far easier to rinse out, so it's the better routine choice.
Limescale, almost every time. Descale the machine, then run a full tank of clean water through it and test again. If it still won't pump after a thorough descale, contact the retailer you bought it from.
A slow pulse is a cleaning reminder, so descale the machine. A steady blink means the water tank is empty. A light that comes on then goes straight off means the float in the tank has stuck. A rapid, continuous blink indicates an internal fault that isn't user-repairable and needs a warranty claim through your retailer.
It can. The five-year Wilfa warranty excludes damage caused by scale build-up where descaling hasn't been carried out according to the instructions in the manual. Descaling every three months keeps you covered.
A descaled machine, fresh coffee and the right dose will fix most of what people think is wrong with their coffee. Our guide to how much coffee to use per litre covers the second half of that.
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