Thanks for that pic Beko - your old Henry HVR200A was fitted with the original green autosave board, the 208100. It seems that newer models are also failing by looking on ebay, I saw one manufactured in 2012, which would have the red 208428 board that my 2011 Henry has in it.
This would suggest that either the main transistor/resistor is overheating and burning out due to impeded exhaust airflow, or carbon dust build up is damaging the components on the boards.
The fact that your "service kit" has the components - all except the main transistor/resistor - on the other side of the board - tells me that the carbon dust build up could well be shorting out the tiny circuits on the old board - because, as you know, carbon is a conductor of electricity.
A very bad design flaw indeed, and a potential ticking time bomb for thousands of HVR200A's with the old type of boards.
IT may pay us to remove the bases of the motor housing every so often to clean off the circuit board, which is found built into the edges of the exhaust porting, and its easily seen by removing the 7 screws from the motor unit (henry's head) and lifting the base upwards away from the head with the head remaining upside down.
It would also be useful to know at what point Numatic started fitting the service kit that Beko shows as standard.
I am sure that AlexHoovers94 will take his head to pieces to find out if his 2013 Henry with the removable face has the old 208428 board or the 208700 modified one