Potterton Promax HE plus turning off after heating up

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Hi lads,
Massive apologies if this is a re-post, I have searched with no luck.

I have a Potterton promax system HE plus that turns on, heats the water then shuts down after about 10mins.
The pump seems to be spinning fine, I originally thought it was this not cycling the water then hitting a temp cut off??

anything you guys would suggest checking next?
The boiler is less than 5 years old, I’ve got 4 young children and they hate cold showers!!

any advice would be amazing!!
Thanks in advance!!!
 
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Are the boiler pipes going in/out of the hot tank getting hot . I.e is there flow through the hw side .
 

CBW

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Check the motorised zone valve, it might be stuck closed.
 
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