Pressure slightly high after repair

[DukeHugh]

Hi
I had someone round today to fix a radiator that had come off the wall and was leaking slightly. That is now fine but while he was working, after sorting the radiator he topped the pressure in the boiler up to 1.6 bar when the heating is off. Just had the heating on and noticed it is now reading 2.1 bar. I am aware the pressure rises slightly while heating is on, but this seems rather high (before it varied from 1.2/1.3 bar when off to 1.7/1.8 bar when on). While he was here he also bled the radiators so they have all been freshly bled so bleeding them hasn't reduced pressure.

Other than bleeding radiators is there a way of reducing the pressure back to 1.2/1.3? this is the level I am told it should be.

He checked the boiler over and apparently it is fine, it was also serviced last November.

 

[gassafe]

1.6 bar when cold is not too bad. I would personally leave it as it is as its only rising to 2.1 when hot.

if you wanted to be on the safe side then vent a radiator into a bucket or open a new drain off valve & release a cup or 2 of water from the system to drop it slightly.

 

[townfanjon]

IMO 1.6 a bit too high, depending on your boiler Manu spec It should be 1.0 ish some are less. Defo bucket / towels out . Drain a bit out. Only when cold , that way it's safer but more importantly you get a accurate reading on your gauge

 

[plumben]

has he left the filling loop connected? slightly open?

 

[DukeHugh]

no, everything is fully closed, will try to vent a radiator tomorrow and see how I get on, thanks for the advice

 

[Deleted member 64964]

I always top up to 1.2 ish, it would be advisable to get it down a bit if your expansion is on the lowside to, it doesn't give you much breathing space.

 

[drip-dry]

2..1 bar is fine,the system expansion depends on the size of the system and the available volume of the expansion vessel,I would normally top system up to around 1.2 bar when cold to save any possible issues however in this case the 1.6 bar top up seems fine but as said when it comes to top up time again keep around 1.2 when system cold
:smile5:

 

[AWheating]

what floor level is your boiler on?

 

[zzzjim]

Not exactly the kind of weather to wait till its stone cold !
( If he bled plenty of air out .. difference between cold and hot may even have changed ! )

 

[DukeHugh]

what floor level is your boiler on?

ground floor

 

[Millsy 82]

Most boilers I top up to 1-1.5ish some I top up to 2 depending on the boilers, the boilers will work up to 3 bar before the pressure relief will kick out so 1.6 then up to 2.1 is not a problem at all. Also if I drain a system fully then I do tend to put a little extra in as over the next 2-3 weeks bits of air will make there way around the system and it will settle down a bit.