combi boiler help please

I have a Potterton combi boiler which was serviced only a month or so ago.The engineer advised me to keep an eye on the pressure.I 'boost' the pressure to 1.5 bar as advised then almost immediately it drops to 1.0.Over a week it drops to the red zone and needs topping up.
Why is the pressure dropping?
Do I need to get an engineer out?
Any idea on cost?
I have a service plan with B.G. that covers the boier but not the radiators e.t.c.
Any help is appreciated.Thankyou in advance.

26 Comments

Banned

you got a leak in a rad somewhere maybe

Original Poster

Have checked all visible parts of the rads.

Banned

if your pressue is dropping, you have a leak somewhere, you havent bled rads have you

The leak could be under the floorboards if you have them concealed.

If the leak is upstairs, then you would eventually see a patch on the ceiling downstairs. If the leak is under the downstairs floorboards, then it could be anywhere.

It's also possible that the leak is on the boiler itself.

Original Poster

the engineer bled them after the service, and said they would probably need bleeding each time I had to top it up.Just getting worried how much water goes in when its topped up and where it is going,(checked the ceilings-lol)


Is there any way of detecting the leak?

Banned

did he top up after bleeding or before? if he topped up then bled then it will need topping up again, not sure why they need bleeding all the time?

sassie;4859283

did he top up after bleeding or before? if he topped up then bled then it … did he top up after bleeding or before? if he topped up then bled then it will need topping up again, not sure why they need bleeding all the time?



They need bleeding all the time because there is air in the system

Original Poster

sassie;4859283

did he top up after bleeding or before? if he topped up then bled then it … did he top up after bleeding or before? if he topped up then bled then it will need topping up again, not sure why they need bleeding all the time?



Hmmmm he bled them after topping up-

Banned

thesaint;4859302

They need bleeding all the time because there is air in the system



i know why a system needs rads bleeding, what i meant is why are they not sortng the air problem out, mine need bleeding at the beginning of the winter and thats about it, its drawing air in from somewhere that should be the problem here

Banned

kt21;4859314

Hmmmm he bled them after topping up-



then hes just released the water back out so the pressure will drop again

sassie;4859325

i know why a system needs rads bleeding, what i meant is why are they not … i know why a system needs rads bleeding, what i meant is why are they not sortng the air problem out, mine need bleeding at the beginning of the winter and thats about it, its drawing air in from somewhere that should be the problem here



I don't think they know about the pressure dropping.

sassie;4859333

then hes just released the water back out so the pressure will drop again



Yes, but the OP has been topping it up.

Banned

whoops sorry, misread the opening post as the engineer boosted it to 1-5 bar, sorry. top it up and do not bleed rads and see what happens, if it drops you have a leak

Get BG out as they will pressure test the boiler. The system shouldn't need topping up this much.

sassie;4859443

whoops sorry, misread the opening post as the engineer boosted it to 1-5 … whoops sorry, misread the opening post as the engineer boosted it to 1-5 bar, sorry. top it up and do not bleed rads and see what happens, if it drops you have a leak



If you top it up, then the rads need bleeding, as there is air in the system.


You need to top it up, bleed the rads, then top it up again.
At the end of the day, the OP knows their is a leak, as she(?) notices the pressure drops to the red zone over a course of days anyway.

Original Poster

If I don't bleed the rads then they make loud noises!

I can't see any fresh signs of a leak in the boiler so guess it must be in the system/rad pipes somewhere.

If I call an engineer out is there a way they can detect where the leak is do you think apart from pulling the floorboards up?

Banned

thesaint;4859500

If you top it up, then the rads need bleeding, as there is air in the … If you top it up, then the rads need bleeding, as there is air in the system.You need to top it up, bleed the rads, then top it up again.At the end of the day, the OP knows their is a leak, as she(?) notices the pressure drops to the red zone over a course of days anyway.



if the op keeps bleeding the rads then maybe there aint a leak

sassie;4859531

if the op keeps bleeding the rads then maybe there aint a leak



She is bleeding the rads after topping up the system after noticing the pressure drops over a few days.

Banned

kt21;4859511

If I don't bleed the rads then they make loud noises!I can't see any … If I don't bleed the rads then they make loud noises!I can't see any fresh signs of a leak in the boiler so guess it must be in the system/rad pipes somewhere.If I call an engineer out is there a way they can detect where the leak is do you think apart from pulling the floorboards up?



did you speak to the engineer who serviced your boiler about the air in your system? maybe worth bumping your BG homecare up to cover the rads too

Original Poster

Broxy;4859485

Get BG out as they will pressure test the boiler. The system shouldn't … Get BG out as they will pressure test the boiler. The system shouldn't need topping up this much.



Great ,so they can tell if its in the boiler-will there be a charge if on the boiler plan do you know?
If its not on the boiler will they be able to detect where it is?

kt21;4859511

If I don't bleed the rads then they make loud noises!I can't see any … If I don't bleed the rads then they make loud noises!I can't see any fresh signs of a leak in the boiler so guess it must be in the system/rad pipes somewhere.If I call an engineer out is there a way they can detect where the leak is do you think apart from pulling the floorboards up?



Yes they will attach a pressure test pump like one of these and if there's a leak it will rear it's ugly head as the pressure is at a great deal more.
http://www.ridgid.com/ASSETS/95E8658791C246328FD10BD7C2791838/1450_Pressure_Test_Pump_3C.jpg&usg=AFQjCNHuOtfuNMKj24nsUoyPo8tIeGZGvA

Original Poster

Thanks to all for your advice and help, relieved that the floor boards are going to hopefully stay in place! B.G will be contacted.
Thanks again.

kt21;4859825

Thanks to all for your advice and help, relieved that the floor boards … Thanks to all for your advice and help, relieved that the floor boards are going to hopefully stay in place! B.G will be contacted.Thanks again.



They will only stay in place if the leak is on the boiler.

Original Poster

Oh No!

Banned

if i was you i would be upping my BG homecare cover

Original Poster

sassie;4859912

if i was you i would be upping my BG homecare cover



Think I shall do that then ring them:thumbsup:.Thanks Sassie, may have to check how long you have to leave it before calling on the cover.

When you introduce 'new' water into the system after a while oxygen/air comes out of solution and cannot escape anywhere except into the rads and needs to be bled out. After a while all the air that is going to come out of solution does and no further bleeding is necessary. If you continually need to bleed the rads it means new water is continually being introduced, usually indicating a leak.
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