facebook.com/groups/Gas999/

I called specialist to recharge and service my boiler but seeing how does it work from this video is absolutely priceless. Thanks for sharing your knowledge.

Had this problem with my combi , checked the pressure in my expansion vessel and after following all the procedures in this video . Found no pressure in expansion vessel and found the valve has a very slight leak with the spit on valve test . Put 1 bar in vessel as per sticker on vessel and all runs perfect . Will get a valve tool and new valve and fix it . You’ve saved me a lot of money …… thanks 👍👍👍👍👍👍

A most excellent video. Told me pretty much everything i needed to know to hopefully sort my problem. I will have a go this weekend. Thank you.

What a clear and comprehensive tutorial! After living with a high pressure gauge for months I thought I had better do something about it before the cold weather really arrives. Before I shelled out for a new boiler, I thought I'd browse KZfaq and came across this 'How to'. I followed the tutorial and it is now fixed! The boiler is a Worcester Bosch 24i Junior - 11 years old. It just needed the expansion vessel re-pressurising. Subscribed!

I am so grateful for this video! Thanks for the clear explanation on this aspect that other videos could not explain half as clearly as you did here! 3 cheers for that!

Great video. This is the sort of information and tips that can give you confidence in the fact that you now know the workings of the expansion vessel.

What a brilliant, clear and comprehensive tutorial - thank you!

Allen good video mate. One thing worth talking about is a possible blockage to the expansion vessel, more likely on the ones with flexy hose connections.

Done the job …got it in …well 2 …heating on …no water down the wall outside …all’s good thank you soooo much would happily pay ..of course cheaper then the plumber ..Lucky for me mine is the same boiler - Brilliant tutorial

Great explanation as always on this great Channel! Never get enough of all this shared knowledge. Many thanks to Alan and all who participate ❤️

This was brilliant, as a complete novice who has no clue about boilers this helped me fix my boiler, thank you!!

Alan,where ever you live I would like to buy you a beer!4 visits from British Gas and they still left the boiler over pressured.My original fault was a faulty diverter valve.They came back several times ,re pressurised the expansion vessel,totally incorrectly as watching this video they didnt de pressure the system full!they then replaced pressure switches,heat exchanger and they basically condemned the boiler.This was costing me time and lost wages.Following the guidance here and modifying a bike pump from Halfords (£40) I have sorted the problem. I will be sharing this video to British Gas as there engineers clearly haven’t a clue.More interested in selling boilers than fixing them.Thanks once again I am totally in your debt.

Another very clear and concise video.I used to find at least 10% of the expansion tank valves leaking and used to carry the short core valves ( perchased from a motor factor, ) I had not seen this valve tool before ,I used to use the cross shaped valve tool with two off the pertusions cut down so I could get the thing in the more challenging positions say down the back of the boiler but leave the stubs so I could turn it,could be quiet difficult sometimes.

Thanks for that Allen. That was the most informative video on expansion vessels I could find👍.

Thanks for the tip! I’ve pumped up my Sime iqe 35 simplicity after following your video. The problem is that I couldn’t find drain tap. So I had to loosen the nut under the expansion vessel to drain the water out.👍👍👍

Thanks very much for sharing this knowledge, really much appreciated.

Thanks for this. Just successfully pumped up my Vaillant having carefully followed the steps you showed. A very easy job in the end.

The best video on KZfaq!thanks guys for taking the time to make this!

Excellent . Very Detailed Video. Thank you Allan. This guy is very much a good technician .

Excellent explanation. Job done

What a great detailed video with clear explanations and fantastic tips too. Well done

Great video for newly qualified engineers. Thankyou

Followed this video to a T! Very easy to follow for a Baxi boiler! Thank you again! I’ll let you know if the pressure drops over the next few days!

Thank you paul well explained Allen your vids are blessing thanks.

Always Excellent video(s). 👍

Loads of great info and tips for those learning. 👌👌

Very good clear walk through, thank you!

Thoroughly explained, thank you.

I just finish the job. Thanks for the help with that video.

That is a brilliant video!

Thanks for this detailed video!

OMG! Wicked Video Thanks So Much Allen and Team WB

Great video well detailed on correct procedure .👍

A really useful and well presented video. Thank you.

Good video, thanks for tip about pushing diverter motor down to drain it

Thanks Keep doing good work

this is a good video .. thanks for this

Great video, very informative. Thanks.

Amazing video! Thank you!

Excellent, thank you.

fantastic video and very good knowledge to have cheers!

Very helpful video thank you.

Very extensive and helpful. well done👍🏼🙏🏻

Very informative Thanks

Excellent video.

Alen you are the best

Excellent video both of you Regards Faruk

thank you for the excellent lesson!!!

When you think you know it all then realise you don't.. ha ha.. good vid

Very helpful thank you!

thanks allen from France

Great video 👌👍

hi thanks for the info , my boiler pressure was increasing to 3.5 bar , drained out the boiler and checked the vessel pressure which was zero, repumped to 1 bar the boiler is now running at 1.5 bar , great help thanks allen

Great video

brilliant. thanks so much

Good one mate sorted for me

Great Vid 👍👍👍

Very interesting video-thanks.

Excellent video

Thank you.

Excellent video Allen. But I cannot work out how to drain my Ideal Logic Plus C35 combi boiler. I find the black plastic plastic part under the boiler with the slot in it. My boiler is new but the pressure fluctuates between 1 and 2 bar (1 bar when cold and 2 bar when central heating on). On my last combi (Worcester Bosch) the pressure hardly moved when the expansion vessel was correctly pressurised. I want to check the new boiler expansion vessel pressure as I suspect installer never did that. Thanks for your excellent videos.

Very good video.

It's good lessons for all engineers, who instead of doing job simply capped at outlet gas supply & keep your family without heating & hot water by month or more to make safe faulty boiler.

Most uk and Irish oil boiler manufactures recommend 0.5 bar or 0.75 max (Grant boilers for one).All the oil systems i work on get cold charged to half a bar and never an issue.Ive noticed some oil boiler safety valves rated at 2 or 2.5 bar to lift rather than the usual 3 bar .Makes sense. I get a lot of customers over charging there oil systems because of the information on KZfaq some gas guys recommending as much as 1.5 bar which starts the cycle of losing water via the prv.Then the custard is convinced they have a leak and spend hours trying to source it.lol. Which can be difficult to explain to some clients.

Amazing advice. I have a worcester greenstat cdi boiler that keeps losing pressure from 1.5 bar to 1 bar every two weeks approx. When it was installed the engineer set it up to 1.5 bar. I was always thinking the expansion vessel was at fault. Is it possible that the vessel is undercharged and is correcting itself somehow?

Thanks, I really enjoy these videos. Would you also use the same method on an additional remote expansion vessel? Or would you charge it live?

Great video sir. What else might it be if not a punctured vessel? I lost complete pressure on my boiler after hearing a weird noise while the boiler was on and when i try to re pressurise the boiler the water goes straight through the over flow pipe outside is this the expansion vessel?

Awesome 👍

Brilliant 👍👍👍

I just had a Bosch engineer fix this issue on mine. Same Bosch boiler as in video. Pressure dropping then when you put it up would jump to 3 bars. He recharged the vessel. Was curious this explained why he did in more detail. Thanks

Excellent video. Any videos on how to charge, discharge check etc expansion vessels on a unvented system? There are two one on my system one is white which is for the hot water and there is one red one for the radiators. If radiator expansion vessel has been charged to higher static pressure than manufacturer specification (recommendation) would this put extra pressure on the boiler heat exchanger. Causing heat exchanger to eventually fail?

Great video, thanks but how do you get the condensation out of air side of the vessel?

Allen, great video, thank you! What is the system telling me when, after pumping up the expansion vessel to 1 bar and opening up the flow & return valves the pressure doesn't go up to 1 bar and stays at around 0? The vessel seems to be holding charge at 1 bar (air mesaured). Should i just fill the system up? I am pretty sure the system is full!

Great video Allen, when fitting external expansion vessels does it matter what rotation they are connected for example can they be piped into the bottom instead of the top (can it be fitted upside down) ?

Jumping up to 3 bar is exactly what my boiler does. Then it makes a loud banging noise a few times and shuts off giving an error code followed by a hissing sound. I thought it was the pump but now I think it might be this expansion vessel. It is a Saunier Duval F25.

My world littrely almost stop , slowly and slower and finally when awaiting for one more word l slept...;)

Great video , my boiler is at 1bar when its cold & goes between 1-2 bar when the heating is on , however when the pump starts from cold the pressure drops to 0.75 bar the rises slowly ! Is this normal ?

excellent

must I drain the central heating section of the boiler before testing the expansion vessel pressure and if necessary it topping up ? I am confused as I understand that when the system is working properly it is quite acceptable to test the pressure in the vessel and get an accurate reading.

👍👍brilliant

Hi Allan, can you do a video with more in depth info on expansion vessels. Particularly when adding an additional vessel to an existing system. I'm not sure exactly what effect the pre pressure and increasing the pressure will have on the existing system. Many thanks

Nice explanation. I thought the water expands and pushes against the air balloon inside. Unless I heard it wrong it was mentioned the other way in the video?

Great video but after following the steps and turning the valves on, the pressure gauge didn't move to 1 like yours did. So what does this mean? Thanks

Can u hold open prv and pump up vessel that way if no drain off 🤔

Hi I just want to ask if there is no charge on the vessel but you can see water coming from the shredder valve what is the cause thanks

great vid.

Hi really detailed video very good! Just wondering if the reason water comes out when you are charging with air is the balloon is expanding and pushing water out the expansion vessel?

Hello, Allen - After watching this video, I checked the Schrader valve in the expansion vessel on my Worcester bosh 24 junior boiler and found it was leaking. I cannot find a replacement valve this small. Do you know where I can get one from? Thank you, Maxx

Nice

Does expansion vessel have to empty of water before repressurising it to 1 bar

You should run ads to get more views your videos are great!

Should the pre-charge be adusted for multi-level residences?

My vessel valve is leaking slowly over time. Can I just replace it, pump it back up until the needle on the boiler goes back up to it's 1 bar where it should be? I don't understand having to isolate, drain down etc unless you are also putting water into the system, is that right? Thanks for the detailed video. I've ordered that valve replacement tool with some new valves which should come tomorrow

Hi Allen. I pressurised a worcester 24cdi to 0.8bar but its not holding pressure. Initially the Schrader valve was letting by. I changed the Schrader valve and pressurised the expansion vessel according to the manufacturers spec. As soon as i turn the boiler on after setting the system pressure the pressure drops down to 0.2 bar . Could it be a faulty pressure gauge or leaking diverter diaphragm?

How do you drain a ferroli appliance

Hi, great tutorial, just one question, when isolating the flow underneath the boiler am I correct in saying thats the flow of the central heating? Thanks

I do everything how you explain and the boiler still run on 3.5 bar

Hi guys I have a system boiler Red Expansion vessel is on the airing cupboard its constantly losing pressure but nothing coming out of the PRV No leaks on the system (rads/pipes) at all

Got a a question how do you re charge an expansion vessel on a hidrotank expansion vessel with pump for mains water pressure