did you have it set on highest level i.e 10 ?
I did and had the same problem after it had been on for 15 mins it stopped working and F2 appeared,
I checked the base motor and it did not seem to be very warm in fact not warm at all !
i checked for F2 but it is not mentioned in any of the below ...
the useless Dyson manual that comes with it, this just shows how to assembly the item, no brainer, nothing about F2 codes etc
Dyson website, totally useless, troubleshooting section does not explain F2 and just tries to sell you Dyson products
I contacted the retailer and they said return the item, they did not know what F2 was though they have sold over 300 units of this model !
if you have this problem, unplug from mains for about an hour then plug back in and switch on, I turned the setting down to say 2 and it ran all night without any problem, I suspect this is an overkill safety feature, I do not know why as even on 10 it is not that powerful, anyway has worked fine ever since, I just put it on high for short periods if required
hope this helps
little message for Dyson if they ever bother to check web feedback, stop producing your models in Malaysia, bring this back to the UK, you charge a high price for your products where for example this fan model AM07 probably costs £50 to manufacture and then you put a price tag of plus £300 on it, bring production back to the UK carry on charging £300, you will still make a packet even with the higher production costs and add ALL the error codes with detailed explanations to your useless manual and website