Combi boiler Water Pressure.

sebastianj

Dear all,
My radiators were not heating up, having blead the radiators I noticed very little water coming through. Checked the water pressure it was very low. I added water to the system and it seemed to work OK.
Problem is that I now have to add water to the system every week or so, is this normal? My water temperatureis very high, can this be a reason? I cannot think of any thing as there are no visible leaks, any help/ advice most appreciated.
Sebastian.

Kiran

The leak doesn't need to be visible especially if it is small and the heating is on. The water can evaporate from the warm pipes. You can get central heating system sealers that you add and they can plug small holes. It's not normal to need to top up on a weekly basis

patanne

Does the pressure go up very high once it is working? Mine did (it's a condensing boiler) and it is the boiler not a leak. My pressure gauge goes from 0 to 4. Under 1 and over 3 is red. If I top mine up to only 1.1, then when the boiler gets really going the pressure now goes over 3. I'm now waiting for the man to come with the part & fix it.

sebastianj

Kiran it is a condensing boiler as patanne suggests, there is no reservoir to add sealer of any sort.
patanne The pressure momentarily goes high to 2 and then normalizes to below 1, .5-.7, I have added water yesterday and it has been working ok I will keep an eye on it and see what happens.
Thanks for the response,
seb

southcoastrgi

tape a plastic bag over the copper pipe outside & see if you get water in it, if you do, it's the prv (pressure relief valve) inside the boiler, you can sometimes clean them but normally you just replace it

PeteDoff

southcoastrgi wrote: »

tape a plastic bag over the copper pipe outside & see if you get water in it, if you do, it's the prv (pressure relief valve) inside the boiler, you can sometimes clean them but normally you just replace it

Totally agree, cheap job to replace (well the prv is a fiver usually and it just screws in usually with PTSE tape) so as cheap as any job if you call in the 'professionals' as you should.

Lgas

You can add leak sealer via a radiator, but that's besides the point. Do you notice the system pressure getting quite high when the boiler is running? (after you have topped it up?). Is it a condensing boiler?