Vaillant EcoTec Pro | How To Change The Expansion Vessel

REASONS WHY YOU MIGHT NEED TO CHANGE THE EXPANSION VESSEL:
- The main reason you would need to change the expansion vessel would be because it has split internally. The expansion vessel should have two sides internally, one full of water and one full of air. When water heats it expands causing the rubber diagram inside to press against the air side. If the expanding water pressure didn't have anywhere to go then it would just activate the PRV (pressure release valve) and then leave the boiler.
This is what happens when the rubber diagram in the vessel splits, it loses the ability for the water to push against the air side and instead when the pressure increases too high it activates the PRV.
Usually the first sign you would notice would be the boiler losing pressure from the PRV. Upon further inspection you would attach a pressure gauge to the expansion vessel and you would notice it's empty.
Another first sign you might notice would be no hot water or heating as the boiler requires some pressure to operate and if most of the pressure has been lost from the PRV (pressure release valve) then the boiler will not operate.
Getting your boiler serviced every year can prevent this as on its annual service the engineer would check the vessel pressure.

[@vind1488]

Excellent, cheers fella now I can go replace the one in my daughter's boiler stress free and I'll be superdad 😊👍

[@darcyhall5906]

Thanks for this video - just followed your instructions to remove and replace the expansion vessel on my ecotec 831. Easy as pie and must have saved myself at least £100 callout/fitting charges

[@bryansmith8780]

Brilliant - really clear and straightforward, thanks!

[@keithaldis8533]

Excellent video mate. Really useful, I now have heat again. Really simple job too. Appreciated!

[@user-li8gr8ur8l]

Cheers boss. Great video as usual❤

[@DJJAMONE]

Your a legend mate im a recently qualified gas engineer from my apprenticeship my firm have asked me to do this and my head almost fell off but such a simple task thank you so much

[@advancedboilertraining]

💪 glad it helped

[@DJJAMONE]

@@advancedboilertraining suscribed keep up the good work

[@garylawton9126]

@@advancedboilertraining is the pressure sensor failing if its showing f75 mate and can it be cleaned up and repaired or gotta renew it and you gotta drain boiler to do them/take em out? Cheers

[@garylawton9126]

Yes? Cheers

[@advancedboilertraining]

@@garylawton9126 Hi Gary, I’ve got a 3 minute video on my channel explaining F75 but to answer your question here: F75 can be caused by the water pressure sensor. Sometimes you can get away with unblocking it with a pin (be careful), I always change them as they’re not that expensive. And yeah you need to drain down the boiler (I’ve also got a video on how to do this on my channel)

[@davidharris8885]

Thank you 👍

[@advancedboilertraining]

💪

[@davidcunningham-silman475]

Great way of showing how to do,

[@advancedboilertraining]

Thanks David!

[@whatyeonaboot]

Great video m8. I've been pumping mine up to 1 but it'll last a month then the pressure drops completely. Do you think its damaged and I need a new one?

[@TheChieflasagnaeater]

Hello mate, best guide around...thanks! A couple of people have asked about changing the PRV - I've looked but still can't see this vid, can you tell me where to find it please?

[@ah-os9ke]

Hi - great video. Thank you. I need to replace the expansion vessel and also the PRV. I can't find your PRV video - Is it still uploaded? Also, can you let me know the order I should do these things. I guess isolate the boiler first, then ....?

[@jecoto971]

DANKE, THANKS 👍

[@danroberts999]

Thank you

[@suheilhanna873]

Legend you are

[@hayche1986]

Thanks mate. 👌

[@ismailrajah2680]

I'm trying to find your PRV replacement video, can't find it. Can you please give me the link. Thanks in advance

[@hamzaparvais3948]

Thanks mate like u videos

[@REBELPRODUCTIONTV]

Bless 👊🏿

[@paulbentley849]

What about the expansion vessel charge pressure is at 15 psi

[@ziarehman4968]

Hi. My boiler loose water immediately after filling in.. through overflow.. plz advise ..tnx

[@paulbentley849]

What is the charge pressure on the expansion vessel

[@advancedboilertraining]

0.8

[@paulbentley849]

What about the charge pressure for expansion vessel is at 1 bar

[@cheekycharly2001]

Trying to find your PRV replacement video.

[@advancedboilertraining]

I’ll get it uploaded on Sunday for you 👍

[@mikeportch8725]

@@advancedboilertraining thanks for the video

[@ros879]

Hi mate, did you originnaly have a grey cap PRV on this boiler? Female outlet connection? Quick fit inlet with a clip.. Finding it quite hard to find the part.. are there any other alternatives? I think part number is 178985 but it shows me only the ones with red cap which are male inlet and outlet.. Thanks.

[@advancedboilertraining]

Are you talking about the Vaillant TurboMax PRV? That’s a grey cap and has female connections

[@ros879]

@@advancedboilertraining that's right.. but when i search for that part it only shows me the ones with the red cap.. but they are male inlet and male outlet, which isn't what I need.

[@advancedboilertraining]

Type in on google “Vaillant TurboMax PRV” I can see that they have them on eBay and city plumbing

[@ros879]

@@advancedboilertraining I'll checkout city first before ebay I reckon. Thanks for the swift response mate. Appreciate that.

[@Robsheph]

good vid ill pay u 100 quid to fit one to mine and also diverter valve

[@abus9669]

How much do you charge to replace this bro?

[@advancedboilertraining]

Hey there, to change a vessel & prv, £250👍. Others might charge more, others might charge less. It just depends on how many people you talk to