Hi Rob - happy to dismantle, but I don't have a multimeter. I can go and buy one though.
On the Bosch there is a panel over the heater and air impeller. In the past I have removed it in order to get to the over heat trip and push the red button in (so closing the circuit for the cut out). Last week I replaced the heater unit (but without a multimeter I was gambling) here is a link to a picture of the part (http://scalexpic.espares.co.uk/71a6ea53-6355-4882-8567-6f8eb8e10415?maxwidth=200&maxheight=200).
This hasn't resolved the problem. I guess that there must be another trip switch that perhaps has failed. Do you know whether that is the case?
Hi Rob - I have put a damp hand towel into the dryer to test it. I was about to take the back off in order to get to measure the voltage across the heater. I noticed that the cover was warm, indicating that the heater must be functioning. So left the dryer to run through its cycle.
The tumbler runs through a sequence of up to 4 stages:
During the "Drying" stage the heater comes on, but does not get as hot - probably no warmer than 40C.
When the sequence gets to "Cupboard Dry" the heater goes of.
I left it run in this state for 15 minutes - the heater stayed off.
I opened the loading door to check the towel - it is still damp, probably as damp as when I put it in. There is no water in the tank.
Yup its condenser:
Its about 10 years old.
I've cleaned out the filters and the heat exchanger).
There was some fluff in there, but not huge amounts.
Hi Rob - I'm in BR7 6AD - what would your quote be? James