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

[Kuldeep]

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.

 

[terryplumb]

What motorised valve/s do you have on your system ?

 

[Kuldeep]

I have no clue, it is valiant eco tech plus 630. its connected with nest and have megaflow.

 

[CBW]

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

 

[terryplumb]

I have no clue, it is valiant eco tech plus 630. its connected with nest and have megaflow.

Then you will need a G3 certified plumber to attend, diagnose the problem and repair.

 

[ianmcd]

Then you will need a G3 certified plumber to attend, diagnose the problem and repair.

Why a G3 terry HW is working ok its the CH that isnt ?

 

[terryplumb]

Why a G3 terry HW is working ok its the CH that isnt ?

I just think it's prudent Ian ,save the OP from getting a numpty.... hopefully

 

[Kuldeep]

Sorry I didn't get why the plumber. here are some pics

 

[ianmcd]

Sorry I didn't get why the plumber. here are some pics

Your pics havent posted