I have a dc07 that is cutting out.

This is not a cable issue.

I replaced ALL filters without exception and it still cuts out.

I cleaned the cylcone with a complete dismantle and it still cuts out.

It sucks like a monster, as good as it ever did but the cutting out is a real problem. If you leave it for 5 mins it will go again for 5 minutes, and so it will go on.

Any suggestions. I have heard it can be a thermocouple or the motor but cant find a thermocouple to buy and dont want to replace the motor unless I have to.
How can I test this?

shepherdess, June 2010

Your theory about an overheat cutout sounds plausible - a thermocouple generates electricity depending on the temperature at its tip - used to measure jet pipe temperatures etc.

You are probably thinking of a thermostat - a simple heat-operated switch which is what many (perhaps all) vacuum cleaner motors have.

To test your theory you might consider something a bit off-the-wall. Operate the machine from room temperature and time the period to cut off.

Some time later - wrap it up in polythene and put it in the fridge - if you can make it fit - for an hour - then see if it runs for longer.

Some time later warm the machine up with a hair dryer and then run it - if it cuts off sooner then you have a probable diagnosis.

If you go to this page....

http://www.dyson.co.uk/store/parts.asp?accessory=ACC-DC0714MOTOR&product=DC07-SY

You will see this text...

Motor 240v YDK £36.31
Not available to order online.
If you think that the motor needs to be replaced, please contact the Dyson helpline on 0800 298 0298.

It may be that the safety cut out thermostat is an intregal part of the motor...

It's a freephone number so you have nothing to lose...

Good luck...

Peccavi, June 2010