brand new honeywell 3 port valve not closing heating port

Are you by some chance getting feed to your rads from the return, particularly as one is next to the cylinder? Feeling the pipes should give you a clue if this is happening
 
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Not sure be to honest got someone coming on Tuesday as boiler overheats when on max seems fine if I turn it down to 2 do you think could be a blockage?
Thanks
 

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