There is a reset button is on the back. But I suspect I am going to get some body out as everything else is working. It's blowing cold air. The other issue itcould be is a timer fault. All areas that are accessible are free of dust n fluff. I'm very careful due to how easily they go on fire .

Kaz
April 2021

Manual here: http://www.whiteknightrange.co.uk/assets/index/download/id/2655/

It does talk about a cut-out that may operate if the machine isn't kept clear of fluff but doesn't mention a reset button.

See this FAQ page form White Knight, however:

https://whiteknightdryers.com/faq/

If there is no cutout then, as "Good Luck" says, the heater may be duff.

acp
April 2017

The machine is telling you that there's a fault with the heater.
It's very probable that the heating element is defective and will need to be replaced - but I just guess. I do not believe that there's a trick or a reset to solve your problem. Do it yourself or call in an engineer.

Good Luck...
April 2017