Valiant system boiler, heating switch on when I switch on hot water otherwise not

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Hello,

I have Valiant system boiler. when I come from holidays noticed the pressure has been dropped. I have corrected the pressure but now new problem started. The heating switch on when I switch on hot water otherwise not.
 
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I have no clue, it is valiant eco tech plus 630. its connected with nest and have megaflow.
 

CBW

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Can you post photo(s) of the cylinder cupboard and any components in there?
 
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