thermal cutout maybe defective

[ringer]

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Our DC04 (S/N 160-UK-166597) packed up but then a few days later it
mysteriously revived. I thought that maybe the airways or filters got
clogged & the motor overheated. I took it to pieces: no blockage &
the filters almost clean. Please does anybody have an alternative idea
why it should have stopped & restarted?

You sell TOCs. Please are these self resetting? I understand that non
resetting TOCs are supposedly safer, but I cannot bear the thought of
having to take the whole machine to pieces in order to reset the TOC
by hand.

[MVacs]

All Dyson TOCs reset on their own.

It may be faulty but its highly unlikely.

Have you bench tested the motor to see how it runs?

[ringer]

[CUT]

Have you bench tested the motor to see how it runs?

No, I dont know how. It does run. Reading other posts, it seems that I must
extract the motor, tether it somehow, & run it. What should I look for? How
much current should it need? Thank you.

[ryevac]

I have had one only that did this on an old dyson cylinder, ended up been brushes were just about worn out - causing excessive current drawn. brushes sorted it.

As Stu says, very uncommon for them to fail.
Just strip machine, the 04 is only a 10 min job to get motor out.

[wolf]

Unscrew the carbon brush holders and look at the brushes are they badly worn is the spring tension ok
how much of the carbon is left on each side, if their ok look at the commutater on the armature for a segment burning away if their is no sign of any of these problems re assemble motor and strap it down side ways and wire it up try it with a 5A fuse,
On the other hand you could be digging to deep it may be a fault in the main lead have you got 240 voltage all the time even when you move the lead about

[MVacs]

On the other hand you could be digging to deep it may be a fault in the main lead have you got 240 voltage all the time even when you move the lead about

Yes, that's well worth a look as well. Waggle the lead and see if it goes off.