Dyson Supersonic Blowing Cold

Assessment £4.99

No fix, no fee · 12-month warranty · Insured, tracked returns

Signs you need this repair

  • Air blows but stays cold
  • Heat settings make no difference
  • Warm at first then goes cold
  • Only heats on the highest setting
  • Heat cuts out but the fan keeps running

If the motor runs normally and the air comes out cold, the fault is on the heating side. That covers a wide range: at the cheap end, a thermal cut-out that has tripped or a temperature sensor that has drifted; at the expensive end, the heater assembly itself.

The Supersonic heats with thin heater elements and a thermistor that constantly measures and regulates the temperature, managed by control electronics in the body. The element and its control electronics are built as one assembly, so a single failed component means replacing the lot, and there's very little independent parts supply for them.

That's why this starts with an assessment rather than a price. You pay £4.99 when you book, which covers the tracked return postage. I open it, test the element, the cut-out, the sensor and the board, measure the outlet temperature on every setting against a known-good Supersonic, and send you a quote. Nothing else happens until you say yes.

If it's the cut-out or the sensor, it's my £85 cutting-out repair. If the heater assembly has failed, it's from £129. Go ahead and the £4.99 comes off, with a 12-month warranty, a PAT safety test and insured tracked return postage included. Decide against it, or if it can't be repaired, I post it back and the £4.99 covers that postage.

I'll also tell you when it isn't worth doing. Dyson list £99 for out-of-warranty repairs, though they ask hair dryer owners to contact them for a price. If your dryer needs a full heater assembly and Dyson will do it for less, that may well be the better deal, and I'd rather tell you than take your money.

Dyson Supersonic with the front ring removed, multimeter probes testing the coiled heating element inside the head

Frequently asked questions

It heats for a minute then goes cold — is that the same fault?
Possibly not. Heating and then cutting out usually points at overheating protection rather than a heater failure, which is my £85 cutting-out repair. Mention it when you book and I'll check that first.
Why is the heater so expensive?
Because the heating element and its control electronics are built as one assembly, so a single failed component means replacing the lot, which is why a heater repair is from £129. There's very little independent parts supply for them.
Would Dyson be cheaper?
On a heater fault, possibly. Dyson list £99 for out-of-warranty repairs but ask hair dryer owners to contact them for a price, so it's worth asking, and I'll tell you honestly if I think they're the better option. On most other Supersonic faults I'm well under that.
What if I decide not to go ahead?
I post it back. The £4.99 covers the tracked return postage, so there's nothing more to pay.

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About this service

How does your mail-in repair service work?
Three steps: book and pay for your repair online, post your item to me using the packing instructions I email you, and I repair it, test it, and send it back tracked. You'll get updates as it moves through each stage.
What is your no-fix-no-fee promise?
Payment is taken upfront at booking. If I can't fix your item, there's no repair fee — I refund what you paid, less £4.99 return postage to send it back to you. Assessment bookings work differently: the £4.99 covers return postage and comes off the repair if you go ahead, but isn't refunded if you decide not to or it can't be repaired.
Do your repairs come with a warranty?
Yes. Every repair carries a 12-month workmanship warranty against the same fault returning. If it does, I'll put it right.
How long will my repair take?
Most repairs are completed within 1-3 working days of arrival, then posted back by tracked post. If a part needs ordering, I'll tell you as soon as I've diagnosed it and give you a realistic date. Diagnostic-led jobs take a little longer if I'm waiting on your approval of a quote.
How do I package my item safely to post it?
I send clear packing guidance when you book. In short: wrap the item well, use plenty of padding, and a sturdy box — the return leg is insured and tracked, and good packing on the way in protects your item too.
Where do I send my item?
Your postage address is included in the confirmation email after you book — you don't post anything until you've booked, so your item is always matched to your order.
Do you cover the whole UK?
Yes — I run a mail-in repair service, so you can send your item from anywhere in the UK. There's nothing local you need to find.
What if my item turns out to be unrepairable?
I'll post it back, and the £4.99 you paid covers the tracked return postage. If you'd rather I recycled it responsibly, I'll refund the £4.99 in full.