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Bosch Excel tumble dryer condensor?

It takes about a minute for the red light to come on. I have to keep jiggling the knob about but I think it's going to conk out any minute!!
June Page, February 2017
On the basis of the garbled description, it sounds like your mains switch is failing.

http://www.espares.co.uk/browse/at1088ma856/tumble-dryers/bosch

You could always do a Google search of your own for the symptoms and other parts suppliers.

XXX, February 2017
link Click here to see other fixes for Bosch Serie 4.