Hannah had the same problem as us - two trip switches trip out if you stop the drying programme in the middle. This has happened several times to us.
I fixed this by removing the top (3 nuts to undo at the back, and the top slides off) and then pressing in two small white reset buttons attached to two wires in about the middle of the machine. They are about 3mm, white buttons, and if you press them and they click in, they have tripped.
This seems to be like a common design fault in these machines.
Note that I am just an amateur DIYer, so please take precautions!
Dommer2000, January 2012