Overheating and cut off on Vaillant ecoTec plus 637

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Do the noises indicate any apparent problems like trapped air or pump issues? Drained and re-filled system last night to remove any trapped air but no joy as you can see; even if it's just on hot water to only heat the cylinder which is the closest 'radiator' to the boiler (also tried heating last night).

Been like this for a few days and even had emergency engineer out who reckons it's just trapped air and auto-air vent in boiler should be replaced first.


Notes:
  1. System power-flushed over the weekend - so almost 100% certain that some residual debris has blocked a part of the sytem
  2. Flow pipe gets very hot and past the zone valves too
  3. Auto air valve in boiler is leaking and is going to be replaced; but still lets out air when I turn it
  4. System completely drained and refilled last night - air taken out after refill and this morning
  5. Past few years, we've had to live with the boiler running for a while (never counted time, but assume 10 minutes) then cutting off as it would get too hot, then run again in a similar fashion (assume because hot water wan't being pumped away fast enough)
 
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Turns out it just needed a second powerflush :whistle:
 
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