Harry Bloomfield writes:

Jon Fairbairn wrote on 21/03/2009 :

So now I've got the covers off and have extracted a thing
that I'd expect to be a pressure switch,
http://www.cyberpieces.com/devis/pieces-detachees-lavage-sechage-g636-0.htm
has an image of something with the same part number.

My questions a

* is it actually just a pressure switch (on/off), or have
these things got more sophisticated since I last fiddled?

That is just a pressure switch.

All those I have come across click when you suck/blow down
the pipe, though I suppose they might have conceivably have
changed to a capacitance type.

That was what I was wondering.

Check the pipe is clear, they do block up other than than
it would be safe bet to get a replacement switch.

I did that, and fitted it. (I didn't dare try blowing into
it). Machine still sat there whirring. Misery. Booked a
call-out, then suddenly thought that the pipes to the new
switch would be full of air, so poured in a few mugs of
water to give it something to chew on and tried again.
Machine ran. Cancelled call out. Happy again.

Thanks for the advice.

--
Jón Fairbairn
http://www.chaos.org.uk/~jf/Stuff-I-dont-want.html (updated 2009-01-31)