Dyson will not start

not trying to be a smart a** but which of the two do you have?
1. A flashing blue light indicates that the battery is running low on charge.
2. A fast flashing blue light indicates no power or a temporary fault (e.g. check filter or for blockages).

FYI....A solid blue light indicates that the battery is charging. No light indicates the battery is fully charged. A solid amber light indicates that the battery is not charging due to a temporary fault (e.g. too hot/cold). A flashing red light indicates that there is a fault, call the Dyson Helpline.
Best to you.

battery has failed to take a full charge. will new a new battery

Hi there, it's Jack at Dyson.

Usually if the indicator light flashes green when the trigger is pulled, this means the machine needs to be charged. If you have had your machine connected to the charger assembly for over 3.5 hours and continue to see the flashing green light, this could mean the machine isn't recharging correctly.

In order for us to diagnose which part is at fault we'd need to take you through some simple diagnostic checks when you have your machine to hand. You can reach our experts directly on 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU).

We'll look forward to speaking with you.

Hi Philip, it's Jack at Dyson.

If you've recently replaced the battery and ensured it's fully charged, and you're still noticing a flashing indicator light, there may be a fault with the main body assembly.

We'd like to take some further details to confirm if this is the case. If a replacement part is required, we can also check whether this is covered under your vacuum's 2-year warranty.

You can reach our experts directly on 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU). Please have your machine to hand when you call so we can run you though some quick diagnostic checks.

This doesn't address the intermittent power cut offs...power cuts off intermittently and you have to keep recycling the power 'trigger' to get it to work...total PIA

There is a small magnet on the pre- filter that triggers a switch. Pull it apart and you'll see the magnet but the switch is behind plastic.. Make sure it is seated well against the motor unit.

How are you charging your battery? Every battery has a memory. If you dont let it die the first come times then charge to full the battery will assume 40% is 100%.