New Combi - Pressure Loss

[jc86]

Hi All,

Wondering if anyone can advise....

We recently had our tanked system replaced with a combi. Baxi Platinum HE. All worked well for a month or two.

However, I recently changed a radiator in the systemt to a larger one. This resulted in lots of air in the system, generally collecting at one of the radiators close to the boiler, so I bled it all off.

Since then, I ahve had to regularly top up the water pressure in the boiler. It seems to lose something like 0.1/0.2bar a day.

I am sure that there are no leaks around the valves of the new rad. I havent seen anything coming out of the pressure relief drain either.

I dont know a huge amount about these things, and dont really want to get the installer out if its soemthing obvious I can sort quickly myself on the boiler?

I dont want to keep topping it up indefinately as I know that it isnt good for the system.

The only other thought is that I could check the pipework under the radiators in case I distrubed it and caused a small leak when I changed the radiator. There are no other signs of leaks anywhere, but I am yet to look under all the floorboards.

Any pointers much appreciated!

 

[delmel]

sounds like air definitely getting in somewhere.

I hate combi boilers. Hope you get some stronger help soon

 

[Madrab]

Only thing that has changed is the new rad, that and the pipework in the vicinity would be the first port of call to check. Wouldn't take a lot to drop the pressure.

When you changed the rad, was any of the pipework/valves changed?

 

[jc86]

Well, the installer changed the rad and added TRVs, but i just opted to change the single convector rad for a double convector rad. I wonder if I yanked the pipedwork a bit and disturbed a joint under the floor. Will get a few of the boards up and have a look....