Unvented central heating losing pressure only in winter

Update : So, I got gas engineer to check the pressure of the expansion vessel.
He checked and confirmed pressure of the expansion vessel is fine and put fernox leak sealer.

But still today the pressure went down close to zero when system was cold and no usage around 3pm

however when i start heating or hot water with out topping up, the pressure goes to 1 bar without topping up.
is still this a problem? is the water leaking?

when pressure automatically goes to 1 bar without topping up during hot water or heating running.
 

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Selvara said:
Update : So, I got gas engineer to check the pressure of the expansion vessel.
He checked and confirmed pressure of the expansion vessel is fine and put fernox leak sealer.

But still today the pressure went down close to zero when system was cold and no usage around 3pm
Click to expand...

You still have an issue, your 'engineer' has failed to properly investigate it and resolve it.
 
What is the issue please ?
Is the water leaking somewhere?
Or is it ab issue with pressure expansion vessel?
 
As already mentioned your pressure relief/temp valve from your cylinder is not connected correctly,(photo one) it should go to a tundish then be piped outside to a drain .Yours looks like it goes back into your heating system.
1699396973646.png
 
Thank you Everyone.
I have attached my picture of my cylinder temp&pressure relief value connected to tundish.
Sir, Please can you have a look at the picture and let me know if this still not correct I will get a gas engineer to look at it.
 

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Last edited:
Another clear picture attached
 

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So water could be escaping somewhere under the floor (tiles) because I have been having this low pressure problem for one year especially during winter:
Should I then get leak detect engineer to detect leak under floor ?
Do they trace the leak with central heating pipe?

Can you advise
 
When the unvented hot water mega system is ideal/cold, the pressure goes to zero on gauge at the unvented system.
but when i start the central heating with out topping up, the pressure automatically goes to 1 bar.
is this normal or any issues? i wonder how pressure goes to 1 bar with out topping up.
 
Selvara said:
When the unvented hot water mega system is ideal/cold, the pressure goes to zero on gauge at the unvented system.
but when i start the central heating with out topping up, the pressure automatically goes to 1 bar.
is this normal or any issues? i wonder how pressure goes to 1 bar with out topping up.
Click to expand...

Warm/hot water, occupies a larger volume, than cold water.
 
is this an issue? do i need to get leak detection to look into ?

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When the unvented hot water mega system is ideal/cold, the pressure goes to zero on gauge at the unvented system.
but when i start the central heating with out topping up, the pressure automatically goes to 1 bar.
is this normal or any issues? i wonder how pressure goes to 1 bar with out topping up.
 
Selvara said:
do i need to get leak detection to look into ?
Click to expand...

You need to get someone who knows and understands how such basic things work, to investigate it, rather than asking endless questions here - when you do not comprehend the answers you are given.
 
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