If your Dyson V15 is stuck in this loop, you're not alone:
- Starts
- Cuts out after a few (3 or so) seconds
- Starts again
- Cuts out again
- Repeats a few times
- Then suddenly runs completely normally
It's a strange, but specific and known pattern; it throws a lot of people off, because the machine isn't dead, and it isn't consistently faulty either. And there is no indication on the display as to what could be wrong, unlike that of when you have a blocked airway, or flat battery. That inconsistency is actually the biggest clue we can use to diagnose what is wrong with your machine.
This is very unlikely to be t a blockage, battery or filter problem.
With most Dyson cordless faults pulsing, weak suction, cutting out under load), the first thing to check is airflow; the filter, wand, cyclones, and floor tool or accessory. A blockage or dirty filter tends to cause a consistent symptom, restricted airflow, a revving sound, weak suction throughout use. What you're experiencing is different: cycling with no airflow symptoms, that then resolves itself and runs fine.
So what's actually happening?
The PCB (printed circuit board, sometimes called the control board) is essentially the brain of the vacuum, it's the little computer inside, and it manages power delivery from the battery to the motor, handles your input (change of speed etc.), and constantly monitors things like current draw and temperature.
When a PCB is starting to fail, a very common symptom is exactly what you're seeing:
- The board sends power to the motor after you pull the trigger
- A fault condition (a common failing component, a capacitor) trips a cutout almost immediately
- The machine cuts power
- It resets and tries again
- This usually repeats several times
This kind of intermittent, self-resolving fault is a classic sign of PCB failure, rather than a mechanical or airflow issue. It's frustrating because the machine works fine after a few goes, which could be seen as a software glitch, but it's sort of in-between, it isn't a mechanical issue, and it isn't a software issue.
Why Does This Happen on the V15 Specifically?
The V15 has a more complex control board than other models. it's managing the LCD screen, the piezo sensor (the dust-counting/particle sensor), auto power adjustment based off the sensor, temperature regulation, and more, alongside standard motor control, and possible built-in obsolescence on Dyson's part- why else would they engineer the machine to have such fine output margins from the capacitors, that after they only slightly degrade, the machine no longer works...
Can It Be Repaired?
Yes, PCB faults on the V15 are a known and repairable issue, and it's not always a body replacement; it's possible that the capacitors in question, or whole motor including PCB, can be replaced.
Need Help?
At VacLab Floorcare Services, we diagnose and repair Dyson cordless vacuums. If your Dyson is still cutting out after trying the steps above, please get in touch for advice, we work on a No Fix No Free basis, and are happy to give out advice to hopefully fix your machine without the need of you brining it to us.