- Appliances
- Personal care devices
White-blue LEDs flashing
Dyson White-blue LEDs flashing on Supersonic r: attachment
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
On the Dyson Supersonic r hair dryer, white and blue LEDs flashing mean no attachment is fitted, and the machine will not work without one. Switch it off, fit an attachment and switch it on again.
Safety first
Stop and check this first
- Do not open the casing to hunt for the cause inside: the manual only asks you to fit an attachment or check the filter, nothing more.
- Let both filter pieces dry completely before reassembly, and never run the dryer with a wet filter fitted.
Safe checks you can perform
- Switch off, fit an attachment and switch on again
- Tell which light is flashing: attachment or filter
- Check the filter with the dryer unplugged and cool
Leave these tasks to a qualified professional
- Do not attempt this professional task: Attachment connection check
- Do not attempt this professional task: Filter cleaning and refitting per the manual
- Do not attempt this professional task: Contact Dyson if every LED flashes together
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Attachment connection check
What they doWhoever helps you should fit a genuine Supersonic r attachment before switching on and confirm the LEDs stop flashing white and blue.
They must show youthe dryer running with the attachment on and no white-blue flashing.
In writingthe HD18 model, which attachment was tried and the result.
Filter cleaning and refitting per the manual
What they doIf the yellow or white LED is the one flashing, cleaning is done with the dryer unplugged and cool, and the filter goes back until it clicks into place.
They must show youthe filter cleaned and dry and the cage seated in position.
In writingthat the filter was cleaned and which light was flashing before it.
Contact Dyson if every LED flashes together
What they doThe manual tells you to contact Dyson when all the white and red LEDs flash together, a different message from the attachment one.
They must show youthe lights flashing together, recorded on video.
In writingthe HD18 model, the case number and the decision of the official brand service.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Switch off, fit an attachment and switch on again
- Who:
- you, with the dryer unplugged while fitting.
- How:
- turn the dryer off, push one of the Intelligent attachments for your Supersonic r onto the machine until it connects, then switch on again. Dyson warns that the attachment must be in place before switching on, because the dryer does not run without one.
- Result that matters:
- the LEDs stop flashing white and blue and air flows normally.
- If it runs:
- the attachment was missing; keep one on before pressing the power button.
- If white-blue flashing persists:
- try another Intelligent attachment supplied with your dryer.
- Evidence to keep:
- a photo of the dryer with the attachment fitted and of the lights that show at switch-on.
Evidence: Dyson Supersonic r Professional hair dryer (HD18) - User manual (UK) · Dyson Supersonic r hair dryer (HD18) - User manual (US)
Tell which light is flashing: attachment or filter
- Who:
- you, looking at the LED panel on the dryer.
- How:
- note the colour: the manual ties a yellow flashing LED to a filter that needs cleaning and a white flashing LED to an absent or badly fitted filter. White together with blue is the attachment message covered by this page.
- Result that matters:
- knowing whether the flashing relates to the attachment or to the filter.
- If the flashing is yellow or white alone:
- go on to check the filter with the dryer unplugged.
- If it is white and blue together:
- check the attachment connection once more.
- Evidence to keep:
- a short video of the exact colour of the flashing lights.
Evidence: Dyson Supersonic r Professional hair dryer (HD18) - User manual (UK) · Dyson Supersonic r hair dryer (HD18) - User manual (US)
Check the filter with the dryer unplugged and cool
- Who:
- you; the filter comes off along the power cord.
- How:
- unplug and let it cool. Slide the filter cage down the power cord and open it at the split line. Separate the two pieces, wipe off hair and dust, rinse them under a warm running tap and let them dry fully before putting them back together.
- Result that matters:
- a clean, dry filter that clicks into place on the machine.
- If the filter was dirty or badly seated:
- after refitting it properly, see whether the message changes.
- If it was clean and seated:
- the attachment remains the most likely explanation.
- Evidence to keep:
- a photo of the two filter pieces cleaned and of the cage refitted.
Evidence: Dyson Supersonic r Professional hair dryer (HD18) - User manual (UK) · Dyson Supersonic r hair dryer (HD18) - User manual (US)
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Appliances
- Brand
- Dyson
- Product type
- Personal care devices
Known code variants
- Dyson Supersonic r no funciona sin accesorio
- Dyson Supersonic r will not work without attachment
- LED blanco y azul parpadeando
- LED blanco-azul parpadeantes
- Supersonic r no attachment fitted
- Supersonic r sin accesorio acoplado
- White and blue LEDs flashing
- White-blue LEDs flashing
What it means
The user manual for the Dyson Supersonic r Professional hair dryer (HD18) lists the Diagnostics message White-blue LEDs flashing: no attachment is fitted and the machine will not work without one. Dyson asks you to fit one before switching on. The same section keeps other lights for the filter: a yellow flashing LED asks for cleaning and a white flashing LED means the filter is absent or not fitted properly. Other models may differ, and the message alone does not prove that a part is faulty.
Warnings and stop conditions
- Mediumeditorial warning
Do not open the casing to hunt for the cause inside: the manual only asks you to fit an attachment or check the filter, nothing more.
Evidence: Dyson Supersonic r Professional hair dryer (HD18) - User manual (UK)
- Loweditorial warning
Let both filter pieces dry completely before reassembly, and never run the dryer with a wet filter fitted.
Evidence: Dyson Supersonic r Professional hair dryer (HD18) - User manual (UK)
Symptoms and causes
Probable causes · in order
- Dryer switched on without an attachment fittedCommon
The manual says an attachment must be fitted before the dryer is switched on, and that the machine will not work without one: this is the literal meaning of the message.
Evidence: Dyson Supersonic r Professional hair dryer (HD18) - User manual (UK) · Dyson Supersonic r hair dryer (HD18) - User manual (US)
- Attachment not fully connected after a swapPossible
The message says no attachment is fitted, so after changing attachments it is worth checking that the new one has really connected to the machine.
Evidence: Dyson Supersonic r Professional hair dryer (HD18) - User manual (UK)
- Filter signal mixed up with the attachment signalPossible
A white LED flashing on its own refers to an absent or badly fitted filter, not the attachment, so look at exactly which lights are flashing.
Evidence: Dyson Supersonic r Professional hair dryer (HD18) - User manual (UK) · Dyson Supersonic r hair dryer (HD18) - User manual (US)
Virtual technician
Does White-blue LEDs flashing still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Secador de pelo Dyson Supersonic r profesional (HD18) - Manual de usuario
Dyson · 2026 · official_doc
- 2
Dyson Supersonic r Professional hair dryer (HD18) - User manual (UK)
Dyson · 2026 · official_doc
- 3
Dyson Supersonic r hair dryer (HD18) - User manual (US)
Dyson · 2025 · official_doc
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