F8
Dyson
Front obstacle or bumper sensor fault
Robot reports F8 and stops near obstacles; may say there is a problem with the obstacle sensors.
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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
Stuck front bumper, Dust on front IR sensors, Damaged bumper microswitch, Faulty front sensor PCB
How to Fix / Troubleshooting
Safety first: Turn the robot OFF before inspecting the bumper.
- Check bumper movement: Gently press the front bumper in and release. It should move freely and spring back. If it sticks, inspect for debris wedged between bumper and body.
- Clean front sensors: Wipe the front IR sensor windows with a dry microfiber cloth.
- Tap test: With the robot powered on and in standby, gently tap the bumper. You should hear or see a response (beeps or lights) if the switch is working (model dependent).
- Inspect for cracks: If the bumper is cracked or misaligned from impacts, it may not actuate the internal switches correctly and should be replaced.
Persistent F8 after cleaning and freeing the bumper usually indicates a failed bumper switch or front sensor board that requires replacement.
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Repair Difficulty
Medium
3/5
Required Part
Front bumper and obstacle sensor assembly
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