White Knight CL847 - 29 July 2005?

Dryer operates for a minute then completely stops I checked the exhaust and it was blocked solid with concetrated fluff. I freed it and still have the same problem. How can i tell what is still faulty.
The heater, the main switch at the front door, the temperature stat to avoid over heating (somewhere inside) or the exhaust stat?

The operation is when start button is pressed - anticrease light comes on for 2 seconds then goes off as the drum turns for 5 seconds then the drum changes direction and the fan starts up and lasts for approx. 1 minute before the main fan and drum stops and the appliance will not come back on, untill i hit the start button again, which repeats this cycle.
There is an automatic sensor for when the clothes are ready so how do i check all these. I checked these settings with wet clothes inside.

Can anything be by-passed to check or is there an operation or diagnostic flow chart anywhere.

thanks Mark 29 July 2005