Not working - 3 blue light on

Even though the Dyson vacuum changed the industry by offering the first bagless vacuum, you may find that it sometimes won't turn on. This is because the vacuum machine has a thermal safety system inside it that cuts the power when it begins to overheat.

You have to wait at least one hour for it it to cool down when this happens, as the machine won't turn on until its recognizes it is cool enough to not overheat the motor. The vacuum can overheat because there is not a free flow of suction through the machine due to a blockage somewhere. When the Dyson powers off during operation, you should:

• remove and examine the foam filter for blockages
  
• verify the clear canister is free of blockages
• check hoses and u-bends to remove blockages
• clean the foam filter if dirty; you have to wait until the filter dries overnight before using it
• clean the other filters in the machine, depending on the model, as each is slightly different.

Verify that, after cleaning the filter and reinserting into the machine, all the components fit together correctly before vacuuming. If the bin isn't inserted correctly or you forget to insert the filters, the vacuum will not work correctly and will overheat.

Since the mostly likely cause of the machine overheating is blocked or dirty filters, you must remove them and wash them by hand in cold water. To wash the filter in an upright machine:

Turn off the machine and unplug it from the wall.

Remove the clear dust bin from the machine by depressing the button on the handle that releases it and lift it away from the machine.

Detach the top of the bin by pressing the latch on the front of the bin and lift the top back.

Reach in to remove the filter. The filter may be flat and round in a plastic case or it may be a cylinder-type filter, depending on the model you have. Some models have both. Remove the foam filter from the plastic cover, if you have that type of filter.

Turn on the cold water and let it run from the faucet. Rinse the filter under cold water until all the fine dust is gone. Squeeze the filter gently to massage any dirt and dust from it under the running water. After the water coming from the wrung-out filter is clear, set the filter aside and let it air dry. For models equipped with the round plastic filter cover, rinse the fabric side of the cover in cold water, and then tap it gently to remove excess water and let it air dry. Set the cylinder-type filter horizontally to dry.

Step 6

Remove the second filter, if your machine has one, from the bottom of the machine. Models equipped with a ball device on the bottom have a filter that you can remove by turning the round inset knob counterclockwise to lift the cover from the filter. Lift the filter out and rinse it under cold water, tapping it to remove excess water after it is clean. Let it air dry.

I took it outta the charger, opened the bin all the way, held down the trigger and she came back to life. Kept it held down as i closed bin in stages. Seems to work now… we shall see if it sticks.

I thought it was the filter - but it was not.

I took the battery off the device (3 screws) , then put it back on (did not do anything to it) - and the Dyson went back on.

I've tried everyhing that people have suggested so far, but nothing works. Battery is fully charged and attached correctly. Filter is clean, dry and inserted, but when I pull the trigger I hear a squeek, but it never starts working. No flashing lights, only the 3 battery indicator lights come on. Anybody has any ideas?

Eventually I replaced the battery, and all works well. The battery (a replacement) held for 2 yrs. Now I bought an original one - let's see how this goes

My Dyson V8 is fried and shorted. It sparked and had a distinct smoke and burnt smell when i switched on the trigger. I opened it up today and still could not find the cause of the short. The motor windings are good and already taken out from the PCB. I am doubting the Mosfet M13C30 which I accidentally found online in youtube to be common fault for this particular model. I am unable to test it at the moment since it has a varnish coating and will try to remove it with acetone later to test if it is also shorted.

I tried poking on the capacitors and eventually removed a 35V 1500uF but it was good. I also tested the SMD R030 resistor and it showed 0.1-0.2 Ohms on my DMM which I am not sure if it is fine (i think it is probably okay as long as it is not open).

I also tested the 2 main terminals and could not verify that it is shorted. My DMM does not detect a short.

I want to buy a replacement motor assembly but hesitant to do it until i figured the cause of the fault of this simple board. The battery was also tested and found 24-25V output when triggered ON. I will try to clean the board with CRC cleaner and put it back and see if it works.

If it smokes then holy smokes I will buy a new motor assembly in Ali Express (probably taken out from other V8 but genuine).