On a Dyson V8 or V10, a red light on the battery gauge means something has failed, not that the battery is just low. Dyson publishes what each red pattern means on the V8 and Cyclone V10, and the difference between flashing red, solid red and red with blue tells you which part is at fault.
Quick answer: On a Dyson V8 or Cyclone V10, one flashing red light means a battery fault, one solid red light means a main body fault, and a red light flashing with a blue light means a charger fault. A flashing blue light alone just means the battery is empty. Contact Dyson, or replace the official part for your model.
| What you see | What Dyson says it means | Try this first | Part if it keeps happening |
|---|---|---|---|
| V8 or Cyclone V10: one flashing red light | Battery fault | Stop using it; contact Dyson | Official Dyson battery |
| V8 or Cyclone V10: one solid red light (in use) | Main body fault | Contact Dyson support | — |
| V8 or Cyclone V10: one red and one blue light flashing together | Charger fault | Try another outlet, and charge without the dock | Official Dyson charger |
| V8 or Cyclone V10: one flashing blue light (no red) | Battery empty | Charge it | — |
| V8 Cyclone: solid red mode light | Normal operation (a power-mode color) | Nothing to fix | — |
Internal: rows DY-B-005 to B-009, B-012 to B-016, B-026. Remove this line before publishing.
[IMAGE: Original diagram of a three-LED battery gauge in four states: one flashing red (battery fault), one solid red (main body fault), red and blue flashing together (charger fault), one flashing blue (battery empty), each with a one-word label]
Safety note: Switch off your Dyson and take it off the charger before you handle the battery. If the battery casing is cracked or damaged, don’t use it and don’t charge it. Never open a battery pack or the machine’s body.
First: Which Dyson Do You Have?
The red-light meanings on this page come from Dyson’s own light tables for the V8 and Cyclone V10, which use a row of battery lights.
- V11 and V15 Detect: these have a screen with alerts instead of a red LED code. See [LINK: Dyson V15 Screen Error — /dyson/dyson-v15-screen-error/].
- V8 Cyclone: its mode light shows solid blue, green or red as normal power-mode colors. A solid red mode light there isn’t a fault.
What Each Red Light Means
One flashing red light: battery fault
Dyson’s V8 and Cyclone V10 tables both list one flashing red light as a battery fault. The V8 table lists it both while charging and in use.
How to tell: A single red light flashes on the battery gauge. The machine may refuse to run.
How to fix it:
- Stop using it and take it off the charger.
- Check the battery casing. If it’s cracked or damaged, don’t use or charge it.
- Contact Dyson. If the machine is within Dyson’s 2-year cordless warranty, a defective battery may be covered. Dyson’s warranty doesn’t cover battery runtime lost to age or use.
If that doesn’t fix it: Replace it with the official Dyson battery: 969352-03 for the Cyclone V10, or 974815-01 for the V8 (confirm with Dyson’s V8 battery finder). See [LINK: Dyson Battery Replacement — /dyson/dyson-battery-replacement/].
One solid red light: main body fault
This one points away from the battery.
How to tell: While you’re using a V8 or Cyclone V10, a single red light stays on solid.
How to fix it: Don’t open the machine. Dyson’s support pages say a faulty main body means contacting customer support to organize a replacement. Call the Dyson Helpline at 1-866-693-9766.
If that doesn’t fix it: Out of warranty, Dyson inspects the machine and gives you a quote before any repair starts. Compare that quote with replacing it: [LINK: Repair or Replace Your Dyson — /dyson/repair-or-replace-dyson-vacuum/].
Red and blue flashing together: charger fault
When the red light and a blue light flash together, Dyson’s tables point to the charger, not the battery.
How to tell: One red light and one blue light flash at the same time.
How to fix it:
- Plug into a different wall outlet.
- Take the dock out of the picture. Dyson says its charger “charges your vacuum with or without the Wall Dok™”, so plug the charger straight into the machine.
- Check the charger cable for damage, and don’t use a damaged one.
If that doesn’t fix it: Replace the charger with the official one: 967813-02 for the V8, or 969350-02 for the Cyclone V10. Charging steps: [LINK: Dyson Not Charging — /dyson/dyson-not-charging/].
Internal: rows DY-B-007 to B-009, B-014 to B-016, DY-D-005, D-008, D-010, DY-F-007, F-008, F-010, F-026, F-027. Remove this line before publishing.
When the Light Is Blue, Orange or White
Not every warning is red:
- One flashing blue light (V8, Cyclone V10): the battery is empty and needs charging.
- Solid orange (V8 Cyclone): motor fault. Contact Dyson.
- Flashing orange (V8 Cyclone): the tool you’ve attached isn’t compatible.
- Flashing white (V8 Cyclone): the cyclone isn’t fitted correctly. Refit it properly.
For a V8 or V10 that shows no lights at all, see [LINK: Dyson Vacuum Not Turning On — /dyson/dyson-vacuum-not-turning-on/].
Internal: rows DY-B-006, B-013, B-028 to B-030. Remove this line before publishing.
Parts that commonly fix a red light:
- Official Dyson battery — for one flashing red light that Dyson confirms is a battery fault. V8: 974815-01 (check the V8 battery finder). Cyclone V10: 969352-03. [LINK: Dyson Battery Replacement — /dyson/dyson-battery-replacement/]
- Official Dyson charger — for red and blue flashing together that doesn’t clear on another outlet. V8: 967813-02. Cyclone V10: 969350-02.
Dyson’s spare parts carry a 1-year warranty. Full list by model: [LINK: Dyson Vacuum Parts — /dyson/dyson-vacuum-parts/]
Repair or Replace Your Dyson?
Repair makes sense if:
- it’s a charger fault, and a new official charger fixes it
- it’s a battery fault, and Dyson still sells the battery for your model
- it’s still within Dyson’s 2-year cordless warranty
Replace makes sense if:
- it shows a solid red main body fault and it’s out of warranty
- the battery has failed and suction has been weak for a while too
- other faults keep appearing
Weigh it up in [LINK: Repair or Replace Your Dyson — /dyson/repair-or-replace-dyson-vacuum/] or the general [LINK: Repair or Replace Your Vacuum? — /guides/repair-or-replace-vacuum/]. For warning lights on any brand, see [LINK: Vacuum Lights Meaning].
FAQ
Why is my Dyson flashing red?
On a V8 or Cyclone V10, one flashing red light means a battery fault. If a blue light flashes with it, it’s a charger fault instead.
What does a solid red light mean on a Dyson?
On a V8 or Cyclone V10 in use, one solid red light means a main body fault. Contact Dyson. On a V8 Cyclone, a solid red mode light is just one of the normal power-mode colors.
Why is my Dyson flashing red and blue?
Dyson’s V8 and Cyclone V10 tables list red and blue flashing together as a charger fault. Try another outlet and charge without the dock before you replace the charger.
Can I fix a Dyson battery fault myself?
You can replace the battery with the official Dyson part for your model, but don’t open or repair the pack. Check with Dyson first if the machine is under warranty.
The Short Answer
Read the pattern: flashing red is the battery, solid red is the main body, red with blue is the charger. Try another outlet and the charger without the dock, then call Dyson at 1-866-693-9766 before you buy a part, especially if the machine is under warranty.