New boiler keeps losing pressure

[Timmy D]

Cut in some isolation valves on the flow and return pipes to the new extension. Isolate just that section and run the rest of the house as is. This will prove if there’s a leak on the new area.

 

[king of pipes]

Thats what I would do and certainly not keep pumping in leak sealer, find and repair the leak and do not keep masking the problem .

 

[ShaunCorbs]

But isn’t that the case with any new floor which is screeded and not put down with floorboards?

you don’t screed floorboards / tile onto floorboards

 

[exedon2]

Better toss this one in,I'm not saying for a minute that its the case on the op's floor but there are specialist screeds intended for use over timber floors.
Often involve d49 reinforcing and p p reinforced pumped screeds I've seen them used a number of times.

 

[kashcheema]

Hi all, thanks for the responses. So i isolated the valves last night, set to 1.5 bar and this morning 10 hours later it is still at 1.5 bar. I guess this means the problem is not in the boiler/system?

I also spoke to my tiler this morning and he does these jobs all the time and always applies the same process, so I am sure he has done the right thing here. Only last month he tiled a 400sqm car showroom in Liverpool and he used the exact same process as he did on mine.

I have spoken to a company which does thermal imaging and will look to get them out in the next few days to detect where the leak is, I will sadly then have to get my tiler back round to dig up that area, get the pipework fixed and retile over. The plumber at this company did mention it may be a faulty heat exchanger, but he said he'd come and take a look. I can't go back to the original company I used as the fella who owns it is going through a divorce and he will be dissolving the company 🙄

 

[Timmy D]

Hi all, thanks for the responses. So i isolated the valves last night, set to 1.5 bar and this morning 10 hours later it is still at 1.5 bar. I guess this means the problem is not in the boiler/system?

I also spoke to my tiler this morning and he does these jobs all the time and always applies the same process, so I am sure he has done the right thing here. Only last month he tiled a 400sqm car showroom in Liverpool and he used the exact same process as he did on mine.

I have spoken to a company which does thermal imaging and will look to get them out in the next few days to detect where the leak is, I will sadly then have to get my tiler back round to dig up that area, get the pipework fixed and retile over. The plumber at this company did mention it may be a faulty heat exchanger, but he said he'd come and take a look. I can't go back to the original company I used as the fella who owns it is going through a divorce and he will be dissolving the company 🙄

What valves did you isolate? Boiler valves or flow/return to just the new section?

If just the new section and you’ve run the system for 24/48h without pressure loss, you’ve got your answer and it’s not the heat exchanger. Funny thing is, I came across a leaking heat exchanger today.