I have already removed the dryer from it's normal site so it is sitting on the floor in the middle of the room with no vent hose attached. It still doesn't heat properly.
It's pretty good, not really strong tho'.
I'll give it a go and let you know.
Just took the back off and ran it (disconnected heater first!) and blower assembly is cleanseems to run fine. I ought to have said that a few months ago the overheat thermostat (with the red button) kept tripping. I took the machine apart and cleaned out all the internal ducts (I think it's 5-6 years old!) and it seemed ok then until this problem occurred. When it first happened I immediately went to reset it but the thermostat hadn't tripped. I also checked the thermostats and they do trip when heat is applied. Do you think something may have been damaged due to the previous overheating thing.
Right, tried that. The control board isn't identical to your pic but similar and mounted on the RHS of the casing back a bit from the switch assembly. That right? Anyway, when I ran it this time it was clicking like mad and the voltage across the element was jumping around a bit until it finally went to zero, as usual. May be on to something here!