Miele T5206 Professional Dryer Anti Crease light flashing

Hi have been helped here to fix my white knight tumble dryer but now my Miele has also gone wrong!
I have a Miele T5206 ex NHS machine – has been brilliant but suddenly stopped heating up and the anti-crease light constantly flashes and cool air light comes on no matter which programmeis selected including timed.
When I got the machine a couple of years ago I had to replace the heater relay but that seems fine.
I’ve replaced the NTC sensor as have read that could be the cause but it has made no difference.
I’ve checked the thermostats on top of the heater but they do not seem to have popped,
Have defluffed and checked that all the wires going to the pcbs are connected.
I am at a loss
Has anyone got any ideas as love this machine. 😥