BOILER KEEPS LOSING PRESSURE – WHY AND HOW TO FIX – Plumbing tips

https://youtube.com/watch?v=4meZgMAUecw

Does the pressure in your Combi boiler or heating system boiler keep dropping? Here's how to fix it! We'll show you why it happens, and how to fix it. We'll show you how the filling loop works with mains pressure, we'll show you how the expansion vessel works and can fail, how the high pressure relief valve can release pressure and how a lack of inhibitor can cause air and a drop in pressure.

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So you've been noticing lately that the pressure gauge on the front of your boiler that looks very similar to some of the pressure gauges that I've got going on behind me at the moment has been dropping down. Now if it goes anywhere below kind of half a bar, then you know that you've got a problem and obviously if it's constantly going down all the time or that recently you're topping it up using a filling loop like then you'll know that you've definitely got a problem. Now there's a few things that can cause this and inside a heating system, the cold water atoms and On a pressurized system, instead of having the expansion pipe, you have what's called an expansion vessel. How they work is very simple. It's very difficult to compress water and so therefore you have an expansion vessel with a rubber diaphragm and on one side of the diaphragm you have compressed air that's usually compressed to one or one and a half bar and on the other side you have your heating system water. So as that water heats up and expands, it gets more and more happy, it can expand into the easily compressed air without letting air into the heating system because there's a rubber diaphragm in the way. So make sure that your heating system is nice and full of water at all times, you have a filling loop that fills up the cold water from the cold water main system and make sure that everything's okay. So now you've got a basic idea about how a pressurized heating system works. Let's look at problem number one that could cause a pressure drop. Firstly and most obviously of all, you could have a leak on your heating system somewhere. When it comes to finding leaks, the best thing to do is pop around all the radiator valves for a start and just make sure there's no leaks on them. Make sure you lift up the heads as well to make sure that there's no weep on top of the valves. Make sure that the compression fittings on each side of the radiator valves are nice and tight and there's no water anywhere. Just go around, run around with your hands and make sure that you've got no leaks there at all. That's number one on the list. Try and stop the leaks. If you find that you can't find any leaks anywhere, always look out for sort of dark brown patches on the ceiling. They can indicate leaks. After that, you're into the gnarly world of pulling up floorboards and having a look under the floor. Things like that can get pretty horrible. So that's number one. You might actually have a leak on your heating system. Number two, most modern combi

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