Combi boiler pressure keeps going very high, is this a problem ?
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- Опубликовано: 10 сен 2024
- Worried about the pressure in your Combi or sealed system ? When the gauge starts off at 1.2 bar when cold but when it has heated up, it is suddenly at 2.5 or higher.
Make sure the filling loop is disconnected, then see if it is still going high. Just in case it is letting by.
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Many thanks Al.
there we go auld hand best in the trade i struggled for a week with normal then very high pressure gas engineer friends (2) says boiler f*****d) no money for that in present times so tried the upstairs rad as extra expansion and hey presto working 100% now so new expansion tank on the cards at £93 compared to a couple of thousand for boiler replacement , gas engineer friends ? go tickle yer ass while watching a true engineer for some tips , like dereton on here ! yer a champ mate no other clips i watched gave much away that 1 with upstairs is common sense but you need to think about that 1st ! thanks again buddy stay safe
Had these problems on an Worcesetr 24 Junior. Kept losing pressure, requiring refilling. Had a very loud vibration, even when whole house water and heating pipes were empty and taps open! Recharged pressure vessel. Problems recuured within hours, but I noticed the pressure swing from cold to hot was less.
Thought there must be water locked somewhere in system as it would be very hard for empty pipes to behave in such manner, so I refilled the boiler to high pressure (2.5 bar), opened the drain cocks on the ground floor, loosening the bleed vales on radiators to let air in, and opened the filling loop for a couple of minutes to get more water in the system. Did this twice for good measure.
Left it alone for half an hour after the system stopped relearing water. Closed drain cocks and opened the filling loop just a little to let the system refill slowly. Refilled to just over half a bar and bled air from each radiatoe individually.
Turned on boiler. Bled air again and topped up just a tiny bit.
The pressure only rises from 0.5 bar when cold to just under 1 bar when hot. No noises so far and the entire system is quiet so far. The loud vibration is gone, and the creaking noises previously heard form radiators and pipes have completely gone. So far so good.
The radiators and pipes have been in the house for around 30 years, with no filter or fancy additives, and the last time the system was drained was around a decade ago, when the boiler was fitted. It has never been serviced. The older boilers were much better. We had a Biasi combi working for twenty years, never serviced, and it ran quiet as a mouse and perfectly for two decades. Everything made in the modern age is cheap junk designed to last a very short time. Welcome to the end of days.
Thanks for your comments .
Couldn't help but notice over the last couple of posts, you've got your winter cap on, :) keep 'em coming Al, atb mate.
Yeh, sorry if they are getting boring at all, but have had so much e-mail in, the best way to answer them all is by using a video.
@@dereton33 Not boring mate, just a cheeky comment
Thanks Al. I shall sleep safe and sound tonight knowing that when I wake I won't find myself riding a cloud when the whole lot blow ups!!
Ha ha, the big bang theory. You are the fist on this time apache.
@@dereton33 I thought the new boilers have a lockdown mechanism to prevent an explosion or is it only on some of them 😁
Very helpful and informative. Actually I thought the 'interruption' by the lady, added to the flavour of the video.
Thanks steve.
Thanks for the information, some very useful tips
My pleasure!
Hi dereton the pressure gauge in my ideal logic combi boiler keeps going up and hovers around 2.4bar while cold. This happens even after I have drained the system and brought it down to 1.3bar. So from 1.3 to 2.4 bar in the space of 20 minutes, I repeat the draining and again it raises, any idea why?
It will raise once the boiler is used. If it keeps getting higher if will drip outside once the 3 bar level is reached. Check the filling loop is not letting by. After that get an engineer in to look for you, it may be a faulty heat exchanger.
@@dereton33 really appreciate response dereton I now have engineer booked for Thursday. Thanks
The black key on my combi boiler pressure valve is broken.can u show what looks like when it's fully closed.im using a wrench but the pressure is going to a bar from bar 1 and I'm not sure if It's left open abit.As I'm bleeding radiators and it's still rising too high when heating is on.,
When the heating is on the pressure always rises as expansion of the water takes place. If the other valve is off as well it will not be leaking any more water into the system as it is a double check valve. Take a little bit of the pressure out if you are above 1.5 bar.
@@dereton33 Thank you I will give it a try
Can I add an extra expansion vessel external to the boiler on the radiator pipes? I think if you are not Gas safe but can handle the plumbing, instead of giving up the radiator you could simply drain the system down and add an extra expansion vessel with a valve to isolate it when that one in boiler will be replaced, is that right?
No.
when i top my pressure up. On the gauge it shows as 1.5bar. then when i come back a few hours later it shows as the pressure has gone up? i release the pressure and brign it back to 1.5 bar and then the same thing happens and a few hours later its back up again. whats going on?
Faulty heat exchanger. Or filling loop still connected and valve letting by. Or a problem with the pressure vessel
My pressure was going up turns out the plumber didn't tighten the tap to fill the boiler up right might be something to look at first just incase.good video
Yes a good point Kev.
Is it possible to have the resting boiler pressure at half a bar so if the expansion vessel isn't working the maximum it will go up to is 2.5 bar? I ask this as when my boiler is set at 1 bar when off, it rises to over 3 bar when on. Seems obvious now the expansion vessel is not working but as a temporary measure could I reduce the resting pressure?
Try, but it might be too low to start the boiler up. It may not be the expansion vessel, it may be the heat exchanger.
Good video
Thanks for the visit
My baxi combi boiler pressure gets high when heating is on, but when heating is off it goes all the way down. What could this be?
As long as it does not drop below 1.3 bar it is fine. If it drops to half a bar then you may have a pressure vessel problem.
How about fitting an external expansion vessel to a combi boiler instead of changing the internal one?
That would be quite a job. Possible though.
When the pump starts running water in the ch wouldn't it move the air from that radiator to others causing them to not heat correctly?
No
Pressure on my boiler keeps dropping over time and I have to top it up every 3 odd months, any ideas?
Every 3 months is ok and quite normal. Evaporation takes place and pressure gradually drops .
You have a very minor leak somewhere most probably on the bottom of a radiator somewhere touch all the connections at the bottom of the radiators with a clean dry piece of tissue paper and see if it becomes damp the thermostatic valves going into the radiators are prone to leaking sometimes. Every three months is NOT normal pressure loss
Mine is 1 when off but goes all the way to 3.5 when it's on? Is that bad
Pretty bad yes.
Pipes started banging like mad, turned on hot tap and it stopped but started again if I turned it off. Tried bleeding radiators, pressure was up to 3! Ran the taps for half an hour. Switched off heating and pressure is currently at 2 and descending. Wish me luck as I turn the boiler on again.
Call in an engineer first.
So do we keep that radiator off all the time . Or set to a number
Keep it off on number 5.
thanks al for the tip and sharing this information with us can do a video how to reaplace your expansion vessel on seal systems and whts your advice thanks.
Will see what I can do Ratch.
Hi
Another cause of pressure going up might be because of a closure in the pipes of the central heating from residue of radiators....
No the boiler would simply switch off.
So let's put a spare radiator in every new install to use as an expansion vessel if needed and normally closed isolating the valves.
No way.
My one goes 2.9 till 3 bar
Too high bring it down to 1.5 bar.