Internal Fault
Dyson
Control PCB or sensor failure
Vacuum displays an exclamation mark or 'Internal fault' message and will not run even with a charged battery.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed main control board, Faulty pressure or temperature sensor, Liquid ingress into electronics, Short circuit in wiring harness
How to Fix / Troubleshooting
Safety: Remove the battery immediately if you suspect liquid ingress. Do not attempt to open the motor housing or control PCB yourself.
- Power reset: Remove the battery for at least 1 minute, then refit and try again.
- Check for moisture: Inspect the machine for signs of liquid spills or dampness. If wet, do not use. Allow to dry in a warm, dry area for at least 48 hours with the battery removed.
- Inspect external wiring: Check the wand and cleaner head connectors for visible damage or burnt contacts.
- Try another battery: If available, test with a known‑good genuine Dyson battery to rule out battery communication faults.
- Service required: Persistent internal fault messages indicate a failed PCB or sensor. These components are not user‑serviceable; contact Dyson or a qualified repair center for motor/PCB replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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