BOILER LOSING PRESSURE - Combi boiler keeps losing pressure? 

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Best video on RU-vid for testing a pressure loss.

Excellent, just the kind of content that makes RU-vid worthwhile. Thank you for making the video.

Excellent video Allen. Thank you for such a detailed yet easy to follow video. You have taken a lot of time to put this together in a very logical way. It has helped so much. Thank you for taking the time to make it. Excellent knowledge and advice, very much appreciated. :)

What a fantastically thorough description of all the steps needed to diagnose the issue with a boiler losing pressure. Thank you so much for sharing this information in such a clear and systematic way - I really appreciate it!

Very informative video Allen, so many different ways for a system to lose pressure, sorts the men out from the boys cracking those problems

Great info Alan , might save me taking up part of the floor👍

Great video mate and thanks for your commitment for taking time out to put these educational videos together. You can’t beat experience good man well done mate.

Brilliant video Allen👍👍you always have my vote 😉keep the good work mate. Bless you

Excellent and informative video. Having completed a couple of gas courses, but not qualified to take the cover off the boiler, brings back all that learning. Really well presented without over the top technical jargon gives a better understanding of my heating system. Thank you.

Thanks Allen, great video, again thanks for taking the time to make this video, very informative, great job.

Hi probably the best video I have ever seen very through other guys don’t give you that much information thanks 🙏 mate

Excellent video Allen! Your teaching and explanation is so good. Its so easy to understand and learn from. Loss of pessure was what i had an issue with my boiler so this is really good to know. Many thanks Allen.

Thanks for helping me figure out it was the PRV causing the loss of pressure, sorted now and working like a new. Can't thank you enough Allen, much appreciated.

I like the way Alan give us all the explanations, very clear and ease to understand. Thank you very much.

glad I found this video, the high pressure on the boiler then turning the valves off is a great tip that I never thought of before, thanks for that

Great video mate very informative. I've also been caught out once or twice with the pressure rising because of a burst in the heat exchanger causing the mains to leak into the heating system and back out the PRV once it hit 3bar

Thanks Allen, I'm now working my way through the possibilities! Cheers Potterton 33 boiler

Mr Hart you are a star, very informative!

Super helpful. Thanks your kindness in posting.

Great information Allen, well presented. When it comes to gas boiler, always call out the qualified gas engineer, absolutely, but great to know how to troubleshoot it, saves time and money 👍

Allen this has been the best video I’ve ever seen it has helped me so much to get a better understanding of the working of a boiler . You given me many more things I need to check and rule out thank you

Excellent article, can't thank Allen enough for it.

Great explanation and illustration.

the gray air valve was open for me mate so i closed it and it fixed the problem so thanks for making this video pal respect

Great video again Allen 👍👍👍

Excellent explanation, you are very good in the way you are describing and making everything clear to understand. Thank you!

Thanks Allen. Very clear and helpful explanation.

Great video thank you for all the information you give us

Thanks for a very informative vid Allen, most helpful

Thank you so much for this video, I just sorted the problem, the heating is working and have saved money xxx

Great video once again. Appreciate it Allen Hart 👍👍

Great job Mr hart Well done

When checking rads and valves I always check them cold, as when they heat up the drips or small weeps can dry up. Great video, looking forward o the next. Cheers Allen.

You explain it so well, I now feel like an expert.

Thanks for your video. Last night i used your info to work out hat the likely fault i#on my wb greenstar 42cdi is heat exchanger split. Will have saved me ripping up some lovely hard wood floors to check pipework. thanks

Thanks mate appreciate your taking the time to reply.

Thank you for this informative video. 👍 Ash.

Informative video, well presented!

GREAT!!!!THANK YOU ALLEN.

Well explained in easy to understand language with good clear video. I fixed my high pressure gauge before calling a plumber. Obviously if it was something more serious I would call a professional.

Thanks Allen. Very well presented and explained!

Hi Allen. Fantastic video's delivered in a no nonsense and clear manner. I wish you were in my area because I would call you for help without hesitation. I have a 12 year old Worcester combi that is losing pressure. When the heating is on 2 it is near 3 bar on the pressure gauge. The boiler has been serviced but the engineer says that it needs a new expansion vessel. Unfortunately the job can't be done until after Christmas so I am just hoping that the boiler will last for another 4 weeks or so. The Worcesters look complicated...after watching your video's I wish we had a Baxi or something similar with a more accessible vessel. Anyway, many thanks for your hard work in providing valuable information in such an honest way...you are brilliant at what you do.

Very helpful to ordinary resident to check a few system check for a leak before calling an engineer.10/10

Thanks for video, saved the day!

Fairly newly qualified engineer here. I found this very helpful - a few things I wouldn’t have thought of were covered. Subscribed! Thank you.

Thank you very much! Very informative! I am not an engineer but found your video very useful as I am having similar problem with my boiler! Hopefully an engineer will sort it out soon! Thank you again!

Great video, it has given me a good starting point. Thanks

Amazing info and clearly shown. great video !

Great info! I've a 440 HiFlow that gradually drops pressure. Turns out, from the filling loop ball valve, so I've that to see to. Drops about 3/4 pint in 24hr in plastic pot, but as the unit's on the floor behind a cover, the drops normally evaporate off.

Good advice Allen

What a lovely bloke. Good video and explanation

Excellent presentation and to the point. Keep with good practice.

First Class video! You are a natural, excellent teacher! Thanks!

Very good content Mr hart well explained keep it up

Boss vid and info Allen mate.

Superbly explained. Will subscribe and learn more

Great video Allen 👍🏻

Very informative thank you.

Thanks Allen your videos are very helpful

Excellent explanation, many thanks.

Absolutely So helpful . obviously I didn't try mend my boiler losing pressure but after my landlord sent plumber out and said " No problem with it!" I was able to explain the problem over the phone.Then the plummer came out again and happily followed this Very helpful video and fixed it! Yes that's what I thought too! Thanks sir for helping my plumber ! 5**

very helpful video, thanks

Brilliant Video, thanks for helping people to do basic checks before calling out gas engineer. wish you look.

Really good video - many thanks!

Thank you Allen! helped me fix an issue with the boiler.

Thank you, Allan.

Very good video you explain very good love your videos

Good video . Thankyou. It showed me to fix mine.

great video Alan thanks

Good video, Alan. One thing I tend to do is, after recharging the exp vessel, wait 10 mins or so and recheck pressure to make sure it's holding ok, before refilling system. Looking forward to your next nugget!

Great video and simple explanation, many thanks

great problem solving. thank you.

All the time!!!! Thank you . The best video .

Your video covers all the usual causes of pressure drop , clearly explained,very occasionally and you can count them on the fingers of one hand the connecting pipe between the expansion vessel and entry into the system has sludged , Vokera Linea was usually the offender .This showed up as high pressure very quickly after turning on .Checking the expansion vessel showed it to be 1 bar . Make sure you deflate the vessel though before you clean it as there is still water under pressure in the vessel.Vokera mynute range was bad for the heat exchanger leaking , back left hand corner sometimes only visible when working.or is that showing my age?

Brilliant video mate..👍👍

Nice one, thanks!

You are a STAR thanks.

Brilliant video.Thank you

Hi Alan. Good explanation of the possibilities you covered. However I have noticed over the last 6 months that the boiler will show zero pressure when cold, will start up perfectly normally and show 1,5 bar when up to normal temperate. IE I do not have to top up, so no leaks. That one is a mastery to me. Also the annual service for the boiler is only 6 months ago, no faults then.

THANKS ALLEN

Great explanation. thanks

Good vid subscribed 👍🏽

EXCELLENT. EVEN I COULD UNDERSTAND IT. THANKS.

Thanks! so useful!

great vid as usual,,,, thank ypu

Great vid 😉

The only combi available that can be fitted on a open vented feed & expansion tank is an Intergas. As is the case for Intergas heat only and system boilers. Any minor very slow weeps do not stop the system from working. When changing an old boiler on a feed & and expansion tank, it may be worth while keeping it when changing to a Intergas. The Pressure Relief Valve can then be capped up. Intergas state that when fitting on a feed & expansion tank, to keep the internal pressure vessel vessel connected. Any pressure rises at the boiler will be partially absorbed by the pressure vessel as well as the feed & expansion tank. When changing an old system from an open vented to a pressurised system leaks can be created on old joints - also some radiators can bust or balloon out and TRV valve bodies leak at the spindles, needed new valves. Keeping an old system open vented has many advantages. If it is not broke do not fix it.

Great video, thank you!

Great video. The other place I’ve found a small leak is on the spindle of the 2 port motorised valve.

Fantastic - thank you - I was worried, I overfilled the boiler as the needle on the guage was slow to respond and after your very helpful video it only took a few moments to bleed the radiator!

Very very good sir. Very helpful. Thanks

Thank you so much for making this clear informative video Alan🙂! I’m having this exact issue now and although I don’t know the exact cause I’m guessing it’s definitely the boiler and not the heating system due to water dripping out of the external pipe outside the house. I had a costly new heat exchanger fitted beginning of last year absolutely broke me so really hoping it’s not an expensive fix. 🙏🏼

Good information

Thanks for helping

With that accent you could tell me my house is about to blow up and I'd be perfectly fine with it and say thank u afterwards

very well explained....

Very Good explanation,, but there are so many possibilities of low pressure as per this video, to eradicate all it will cost a lot, especially inspecting all radiators.

Top man!, thanks to you my customer has no choice but to pay, hes had another builder in before me and the system has been empty since January, he asked me to hang and connect up 6 Rads, and get it pressured up, but i prewarned him about possible faults on boiler because its been empty so i covered my ass, but thanks to the advice from tou about seperating the system overnight to diagnose the boiler or system im getting Payed thanks im most greatful

good video,thanks