Boiler filling loop advice

[Charlie Jez]

On my Valliant eco tec boiler the pressure guage is on red when cold . I drain a radiator to correct to pressure and it works fine and stays in the safe zone . When I switch boiler off the next day it’s back in the red
It could be one of the valves leaking .
Can I take the loop off , which I know should be off , and use capping blanks ?
Would capping blanks solve the problem of a leaking valve putting more water into the system . I can’t get a plumber at the moment due to time of year . It means I have to drain a radiator before I can switch on heating each day . It might be just one of the valves not closing properly. I will check this but I thought why can’t I just use capping blanks which are meant to be on anyway I am informed
Would appreciate any advice
Thank you for any help

 

[cjg]

it may be. but i would think that its your expantion vessel has lost its charge.

 

[Charlie Jez]

Thank you . Strangely today it’s back in the safe zone? I realise it could be that but I wanted to check the other things first . I will see how it goes

 

[A I Plumbing]

Hi. Most filling loops have two valves. One at each end . This is incase one valve fails. (By pass ). Always make sure both valves are turned off ( if fitted ). Hopefully will fix problem of pressure increase

 

[Charlie Jez]

Thank you . I don’t know why but it worked fine today but I did bleed a bit more water from the radiator. I will check tomorrow. Maybe one of valves on the loop was not closing correctly. I will check tomorrow
Thank you for your kind advice

 

[Oliver1234]

Hello,
I have a flexicom.cx that hasn’t been used a while: The filling loop doesn’t seem to be filling.
Has it dried out?
Grateful for any advice