BOILER LOSING PRESSURE - Combi boiler keeps losing pressure?

#Lowpressure LOSING PRESSURE? Does your combi boiler or system boiler keep losing pressure. Central heating system losing pressure. Boiler losing pressure. Expansion vessel, PRV, Heat exchangers. This video will show you how to check if your boiler is leaking. We will show you how to check the heat exchanger for leaks. How to see if your radiators are leaking. Repressurising your central heating and the pressure keeps dropping. Solving low pressure in your combi boiler. System boiler losing pressure. Pressure keeps dropping in my central heating system. why is my boiler losing pressure overnight? How to find the reason of your combi boiler pressure drop. www.cchleeds.c...

[@AllenHart999]

Candlelighters children's Cancer Charity. www.justgiving.com/fundraising/cchleeds How to operate EPH control kzbin.info/www/bejne/np6kn5mMerp4a9U How to wire opentherm kzbin.info/www/bejne/mGTYnamrj7uYnc0 How to wire EPH controls kzbin.info/www/bejne/ppbUequJqqlggNE

[@duncanturner-q8d]

bro has 2 boilers 😂😂😂

[@johnsecurityfns4719]

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

[@AllenHart999]

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[@colinanderson663]

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!

[@AllenHart999]

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[@nickabel4671]

Great video Allen my combi losing pressure overnight, i pressurised to 2 bar isolated the boiler as per the video ( both pipes off) and turned off and it still lost 1 bar of pressure during the night so im assuming the problem is with the boiler ? And not the heating system!

[@edmetcalfe8974]

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

[@AllenHart999]

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[@bobbartram2119]

Brilliant step by step guide and dealt with all aspects of boiler loosing pressure and testing step by step. Many thanks.

[@rachelmarney4138]

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**

[@AllenHart999]

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[@manudsUK]

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

[@AllenHart999]

You are welcome!

[@AllenHart999]

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[@Robbie-f4f]

Isolating the flow and return is brilliant,great guide through the system

[@craigsteele4344]

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.

[@sydbell8508]

It is if you speak same language innit ???

[@AllenHart999]

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[@thepanda4067]

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.

[@AllenHart999]

Thank you.

[@XG393]

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.

[@AllenHart999]

Glad it helped

[@purgeface9661]

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

[@AllenHart999]

Glad it helped

[@carlquirk7586]

What a lovely bloke. Good video and explanation

[@AllenHart999]

Glad you enjoyed it!

[@AllenHart999]

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[@Bbcvgfffc]

Best video on KZbin for testing a pressure loss.

[@michaelstott734]

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.

[@AllenHart999]

Thank you

[@maheshtrivedi570]

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

[@AllenHart999]

Thank you.

[@Charlie_Crown]

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 👍

[@AllenHart999]

Great point!

[@davidpritchard7552]

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

[@AllenHart999]

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[@davidpritchard7552]

@@AllenHart999 will and fyi I have sorted the problem by repressurising the expansion tank.

[@lauramiller579]

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. :)

[@AllenHart999]

Thank you for watching 👍

[@haileselassie6861]

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

[@AllenHart999]

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[@williamedward2259]

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.

[@AllenHart999]

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[@AirborneNigel]

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

[@AllenHart999]

Happy to help, Thank you very much for watching.

[@coopstheplumber]

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

[@AllenHart999]

Thank you.

[@andrewsheppard8083]

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

[@AllenHart999]

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[@paulharrison3538]

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

[@AllenHart999]

Thanks

[@PES_COMMUNITY_REAL]

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

[@AllenHart999]

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[@servermughull9330]

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

[@AllenHart999]

Thanks.

[@petecurran3995]

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.

[@AllenHart999]

Hi Pete, Did you manage to sort it out? Thanks.

[@johnnicholson223]

Thanks Allan, very helpful video My boiler is oil fired but the pressure side and valves are much the same. I have topped up as you said and the pressure increased when hot. The expansion tank is full of water so l presume that I need to replace it.

[@AllenHart999]

Might just need a service.

[@honestydaily6018]

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

[@AllenHart999]

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[@A2Z1Two3]

Always remembering that a little knowledge can be a dangerous thing , that is why Allen recommends getting a registered engineer in to fix anything that we might have diagnosed .

[@laurenjamesince]

Really helpful. What a lovely guy and a great teacher

[@johnoakes8072]

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

[@AllenHart999]

Thank You

[@AllenHart999]

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[@maxnavsa4470]

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.

[@AllenHart999]

+max navsa Thank you for your kind words and supporting my channel 👍

[@mikehopkins4040]

Very good but when I went out too check the pipe to see if it was wet it was covered by a plastic shroud there seemed to be a plastic pipe inside the shroud couldn't really tell if it was wet didn't see any damp on the wall .I will try a few of the other things you showed us.I have an Ideal boiler 6 months old.

[@claudiastanley2708]

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

[@AllenHart999]

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[@1943L]

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.

[@AllenHart999]

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[@harshadchauhan3559]

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

[@AllenHart999]

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[@jimmyboy630]

Awesome video. Thank you. Immergas Intec Combi boiler is losing pressure over 13 minutes running from 1.1bar to nil E10 error. Expansion vessel replaced 24 months ago and today recharged with air (no water in vessel). Bled rads to get some air out of system. Now recharged and testing heat exchanger overnight having isolated F and R valves. Will 1.5bar be enough pressure to test? Very strange. Suppose I have to now have a look for leaks... baffling 😢

[@MySmallWindow1]

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!

[@AllenHart999]

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[@adekassab5589]

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

[@AllenHart999]

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[@psebast3981]

Mr Hart you are a star, very informative!

[@AllenHart999]

Thank you kindly

[@bigt3081]

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.

[@AllenHart999]

Thank you.

[@vivaint08]

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.

[@FhoyFhoy1888]

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

[@AllenHart999]

Thank you 👍

[@stevewilliams6637]

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!

[@AllenHart999]

Steve Williams Thanks 🙏

[@theman1233570]

Steve Williams at 7:56 the auto air vent u said it has to be closed all the time???

[@alanb1935]

A few months ago, my son called out gas engineer in Colchester as the boiler had shut down due low pressure. Without any testlng quoted £425 + vat for new expansion tank. I went over to find tank Schrader valve leaking. Obviously saw him as gullible

[@ericmcrae7758]

Good video Allen. I am not a plumber but its worth mentioning when tighten the pipes to the rads do not over tighten the nuts on the copper pipe as you can "neck" the pipe at the olive and it will never seal properly. Don't ask me how I know. My son had a pressure drop and we found a pin hole leak under the floor, pure luck that we found it. I saw another video that these can be caused by pipes not being de-burred prior to soldering.

[@AllenHart999]

Thank you for taking the time to watch my video.

[@clairejones9775]

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!

[@AllenHart999]

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[@paulkalus41]

Thanks Allen. Very well presented and explained!

[@AllenHart999]

Glad it was helpful!

[@AllenHart999]

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[@MrCamohoj]

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

[@AllenHart999]

Happy to help, Thank you very much for watching.

[@mikeliv8827]

Great video very interesting. I have had a leak on my Worcester Bosch 28 CDi for years now, had a second heat expansion vessel added because my engineer didn't want to remove original expansion vessel inside boiler case , vent valve on top of boiler replaced, have also monitored the pressure relief valve , leak is still there and have to increase back to 1.0 bar once a week on average when using central heating. I have also noticed now and again if i tap the boiler pressure dial on the front of boiler it sometimes moves the needle. Has this been the issue all along? I was also watching a you tube video on how to detect a leak be it wherever in the system by smell, think it was Skill Builders You Tube channel. The suggestion made was to add something very smelly into the heating system, eg TCP? or perfume etc as long as it's not corrosive. Then in theory wherever that smell is in your house thats the place to start investigating. (Not done that yet) My worst fear though is that the leak is under the floor boards, house was built in 1935 , foundations are non existant just bricks laid onto clay, just pure dirt under the boards, very little height available have to crawl on stomach. So would be hard I reckon to find leak, maybe a copper tubing joint is my best guess?

[@robbiethistle201]

Hi Allen, thanks for another easy to follow video, over the last 2 weeks, I've had to call out British gas engineers, but now I'm still having exactly the same problem, it just seems endless, low pressure one minute, then as you explain, high pressure the next, I've got a service plan with them, but, they still charge me £99 excess for each call out, but the problem still exists, if I had hair, I'd be pulling it out! It might be like you say, something like the pressure release valve, none of the engineers has gone outside to look to see if there's water or watermarks outside, ok, rant over, thanks again for this video, 👍

[@AllenHart999]

Thank You

[@AllenHart999]

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[@Vimes.]

Thanks for posting this. Just to confirm, if I set the Baxi boiler pressure to 2 and then unplug it, turning off both 22mm flow and return pipes for the central heating and wait and watch........that should be reasonable enough to suggest an ongoing pressure drop is either related to our system or within the boiler..? We had a Baxi, under warranty, engineer visit us due to pressure drop, slow but regular. He could find no issues each time wit h the boiler but the expansion vessel was at 0.35lb pressure. So he reinflated it. All 8 rads have had kitchen towels underneath their valves, no leaks noted at all. A few years ago we had full 15mm copper / Hep20 piping fitted, not much of it underfloor, some run on the skirting boards. All looks good. Doing this type of test could help to confirm whether the boiler or the system is at fault. I assumed that the boiler might only be leaking when it is in use, something to do with the heat etc..? But, perhaps that is why you raise the pressure to 2bar..? Thanks, and subbed :)

[@pauldryden2692]

Thanks Allen. Very clear and helpful explanation.

[@AllenHart999]

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[@alanfarnod7536]

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

[@AllenHart999]

Thank you for watching.

[@stitcheruk1150]

Alan, The couple of ozs discharged is over two days and nothing like the amount water going in to top up. Thanks

[@AllenHart999]

Thank You

[@tonymills1978]

hello allen new to your channel my boiler has been losing pressure for about 10 years. the engineer's say its leaking from the pipes in my floor which is concrete ☹ when i turn on my heating the pressure goes up to 2 and half. really enjoyed the video.

[@AllenHart999]

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[@duro845]

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

[@AllenHart999]

Thank You

[@eddyhammerton3310]

Thanks Allen your videos are very helpful

[@AllenHart999]

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[@patrickkalisz5461]

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

[@AllenHart999]

Thank you for taking the time to watch my video.

[@tonycartwright7965]

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

[@AllenHart999]

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[@acostin4004]

Hi Al we had a new baxi installed in october and its already losing pressure every few days gonna check under floor etc for leaks didn't expect this after such a short time after installation...

[@AllenHart999]

I wouldn’t have thought it would be the boiler. Have you checked around the system. Places such as radiator valves etc? Thanks.

[@havocchanel]

Thank for that, great video! One question, silly one I believe... but: "with flow and return valves turned off, leave it if possible overnight"... with boiler being OFF right? Or not? You didn't really said should we turned it off or let it "run" even though it cannot push water in any direction.

[@shahzadchoudhary3845]

Thank you for making this video,it helped a lot.🎉🎉

[@kroneditor9266]

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

[@AllenHart999]

Thank you.

[@simonFellows-p3c]

Super helpful. Thanks your kindness in posting.

[@martynlewis4344]

While working for Baxi, used to get warranty calls for combination boilers fitted with 8ltr expansion vessels in turn connected to heating systems with 13/14/15 rads some of which were double panelled. Customer complains boiler keeps losing pressure, yeah you bet it will :)

[@AllenHart999]

Absolutely, Stop on. We need to size the expansion vessels correctly. Thanks.

[@AllenHart999]

Spot on even lol.

[@raycarrington7672]

hi Allen great video. my boiler was fitted just before xmas ( baxi 800 )and i have to top it up every morning grrrr thought this was the norm until i watch your video . so i filled up to two n a half bar then switcht it of and turned the isolation valve off and the return valve. The next morning the needle was on zero. please what is my problem ?

[@AllenHart999]

Sounds like you have a leak.

[@paulbentley849]

To pump up the expansion vessel do go by the manual or the label on expansion vessel

[@AllenHart999]

Always read manufacturer instructions.

[@whoisme678]

Thanks for the info on how to determine what's wrong with boiler. Thanks for also pointing out how dangerous it can be to mess with boilers. 👍. A little knowledge Can be dangerous. Not good when you've put new laminate down to have to maybe take it ALL up 😭😭😭😭 if not mentioned in previous videos is there any chance of mentioning 'Magna Clean' and how disconnect and refit.

[@AllenHart999]

kzbin.info/www/bejne/gICnqqKBaZWorZI

[@AllenHart999]

Thank You

[@johnboy1232]

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?

[@javidmohammed9498]

Great video once again. Appreciate it Allen Hart 👍👍

[@AllenHart999]

You are very kind. Thank You.

[@vim1471]

I have a Worcester Bosch Greenstar 30i that loses pressures after the heating as been on. I've pressed the schrader valve on the expansion vessel and water comes out. I haven't noticed the the pressure gauge going over 2 bar or leaking outside. Am assuming the expansion vessel needs replacing due to water out of the schrader valve ?

[@altrotamundos7241]

Excellent information Allen. I have the loosing pressure problem, the radiators seem OK. I went to check the Expansion vessel and when I tried to connect my pump I had a lot of water coming out of the Schrader valve. I am guessing that the membrane in the EV has gone, but would like your expert opinion, before I get it changed. Thanks in advance.

[@AllenHart999]

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[@samxu4731]

great problem solving. thank you.

[@AllenHart999]

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[@chriscars3578]

Great video again Allen 👍👍👍

[@AllenHart999]

Thank you Chris.

[@dougie151185]

Thanks mate appreciate your taking the time to reply.

[@AllenHart999]

No worries

[@geofchan3577]

Hi Allen, I have a ideal combi boiler. The pressure gauge needs replacing. It looks like a direct unbolt bolt on sort of job. Do you have a video for this? Cheers

[@AllenHart999]

I would advise you get a plumber who is gassafe to sort it. Thanks.

[@giogio4833]

I had two leaks on mine....filler loop and plastic pump housing. ..managed to get a pump housing and swap pump over..don't take much loss for pressure to drop.

[@AllenHart999]

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[@mohali6099]

Very very good sir. Very helpful. Thanks

[@AllenHart999]

Most welcome

[@AllenHart999]

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[@mohali6099]

@@AllenHart999 already have Allen. Love your vidios bro

[@jasmynrich7882]

Hi, if I was to do the check boiler step, do I turn the boiler off? Then close the valves? Or leave it powered on? Thanks

[@AllenHart999]

Hopefully you sorted it by now.

[@paulymuckerpup2129]

Great video Allen 👍🏻

[@AllenHart999]

Thanks 👍

[@AllenHart999]

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[@leehavers1285]

Really good video - many thanks!

[@AllenHart999]

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[@alanastbury4690]

Great video but could you pls explain when you said low pressure as a one off situation what could be the problem on this occasion many thanks for your time and knowledge

[@AllenHart999]

Which part?

[@alanastbury4690]

@@AllenHart999 sorry I forgot you do a multiple of videos and again I have learned so much from yourself but I didn’t understand when you spoke about low pressure in a combi boiler as a possible one off,do you have any idea why this may happen I have seen it on a few occasions but never understood why cheers

[@ashy1423]

Thank you for this informative video. 👍 Ash.

[@AllenHart999]

Glad it was helpful!

[@johnhurrell9312]

I've got an ideal logic. Seems to be leaking from the venturi?

[@rickharrison6416]

When a combi boiler is off ie heatings off and hot taps not running...should the pressuer be on 1 bar or will it be on zero???

[@fraumahler5934]

Thank you, Allan.

[@AllenHart999]

Thank You

[@levi-yb6wc]

Very good content Mr hart well explained keep it up

[@AllenHart999]

Thank you for taking the time to watch my video.

[@wilsonsuarez7068]

I have a Luna 3 BAXI Comfort and I have a problem where it is giving me an error 04E so what do I do in that case.

[@richardwallinger1683]

my air pressure had not been set from installation . i pumped the tank up to 1 bar and the boiler is no longer loosing pressure . obviously allowing the pressure to fluctuate without leaking from the presure blow off valve .

[@rajinderkumar4305]

Hi allen i had questions about leak . I had main 30 ecolite . Water pressure goes lose always now i check it i find a water come out from condensation pipe . How i can sort out that i check prv .thats alos seems good no leaks . I check vessal as well that also fill with air not a problem i seen all radiator and pipe work & drian off not a leak . I checked AA vent thats also good no leaks . ? I only look just seen condensation pipe water out from there do i need to clean that trap ? . Pls guide me your good experience like this type of boiler . Thanks

[@jazzyflash1]

Hi. Great video. My pressure gauge and filling loop are external to the boiler. I suspect my heat exchanger is leaking. Will your suggestion of turning the flow and return on the boiler overnight , and then opening later to assess the pressure still work ? Someone has suggested cutting the condense pipe to see if I get a drip out of there. Thank you for your help

[@AllenHart999]

did you sort it?

[@Jack-lf7vj]

Hi, my logic E35 has a gauge on CH inlet pipe so if I close it for the test can the gauge still measure the pressure correctly, or should I leave it open?

[@AllenHart999]

Not really sure what you are asking, Sorry.

[@AbdulKhan-gu1gk]

EXCELLENT. EVEN I COULD UNDERSTAND IT. THANKS.

[@AllenHart999]

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[@Starslider]

Thanks for a very informative vid Allen, most helpful

[@AllenHart999]

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[@futurecarslondon1109]

Allen please need help. My bathroom sink hot and cold water mixer tap are very noisy of water pressure when I use them at night.And my toilet water tank and shower taps are not noisy at all when used. Its only the basin mixer that makes the water pressure noise. Is this noise could be caused because of the Flexible Hose of 10mm bore to the mixer.Please advise.

[@AllenHart999]

You will need to call a plumber out to have a look unfortunately. Sorry.

[@Robert-s5g1s]

My boiler has been losing pressure. British gas has checked radiators and they seemed dry. He pumped up the expansion vessel as that was flat. He repressurised the system to 1.5 but told me I might need to repressure it in a day or so as there could be still air in the system which I had to do a day later. I topped it up yesterday to 1.6 and overnight its gone down very slightly to 1.5 and havent had heating on overnight. Could that be a normal drop (maybe still air in the system) or should that have stayed at 1.6

[@arianxhebraj6107]

GREAT!!!!THANK YOU ALLEN.

[@AllenHart999]

My pleasure!

[@johneyles5636]

alan if no water comes out of prv valve on outside in garden..is the prv and expansion unit ok..??

[@AllenHart999]

you do not want water to come out of PRV. Thanks.

[@AllenHart999]

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[@slaysi]

Hello, I know you may not reply but I’ve been having to top up my boilers pressure on a nearly daily basis. The only leak I can see is from a plastic pipe joint connected to the bottom of the boiler to outside, which I am assuming is the condensate pipe. I’m not really sure whether the condensate pipe could cause a loss of pressure. I have also noticed that the pressure only drops after the central heating has been on.

[@rayc1503]

Sounds like your expansion vessel needs repressurising or has failed. If your loosing water through the plastic overflow pipe then it's a split heat exchanger. More then likely just the first thing mentioned.

[@markthompson6540]

I had an old boiler. Worked for 30 + years with xxxx all problems. If it hadn't been for needing to get rid of the hot water tank I would not have replaced it. Any savings in fuel on a new boiler are lost many times over in services and repair.

[@AllenHart999]

Thank You