Baxi 105 HE pressure problems??

[Jenniw]

Hi I've had a look at previous threads regarding this problem/boiler but unsure if this is the same issue. Our 4 year old boiler keeps dropping pressure. We top it up to about 1.5 bars and it works fine but immediately the pressure starts to slowly drop eventually to zero. So that normally the next time the heating tries to come on it can't (I assume due to lack of pressure).

We have BG cover and they are due to come out for a service in a few weeks. Is it ok to carry on topping up the system everyday until then or does this need looking at more urgently? And any idea what the problem could be?

Jenni

 

[linkyplumb]

It sounds as though you have a leak on the system somewhere.
You should have a pressure relief pipe exiting to the outside, somewhere under your boiler. Is the end of this pipe dry? Any wet/damp patches underneath the boiler?
How long does it take for the pressue to drop?

 

[gas112]

With the weather being mild isolate the boiler from the rad circuit for the day and see if pressure still drops if it does it is a faulty heat ex in boiler. If it stays at same level then you know its on rad circuit.

To isolate ,look under boiler an on the 2 outer pipes left an right there is a black lever facing you turn these to the side and that the boiler isolated

 

[Jenniw]

It sounds as though you have a leak on the system somewhere.
You should have a pressure relief pipe exiting to the outside, somewhere under your boiler. Is the end of this pipe dry? Any wet/damp patches underneath the boiler?
How long does it take for the pressue to drop?

Thanks for the reply! Water is dripping outside from the plastic pipe. No sign of leaks inside under the boiler or near any of the radiators. It takes a few hours for the pressure to drop right down to zero...

 

[Jenniw]

With the weather being mild isolate the boiler from the rad circuit for the day and see if pressure still drops if it does it is a faulty heat ex in boiler. If it stays at same level then you know its on rad circuit.

To isolate ,look under boiler an on the 2 outer pipes left an right there is a black lever facing you turn these to the side and that the boiler isolated

Thanks we will try this tomorrow!

 

[namsag]

If its constantly dripping from the plastic pipe even with heating off then your problem is within the boiler and it is the secondary heat exchanger that has gone also known as a recupurator or something like that

 

[NEALDEAN]

If its leaking from the pressure relief pipe outside and the pressure isn't going above 3 bar then it's the pressure relief valve that's passing. This will cause the boiler to loose pressure. If its not rising above 3 bar then it's nothing to do with heat exchanger or expansion vessel.

Leak or passing valve is what you need to be looking at.

Different story if it's rising to and above 3.

Keep an eye on the pressure and see what it's doing.

 

[BARNY78BG]

If its leaking from the pressure relief pipe outside and the pressure isn't going above 3 bar then it's the pressure relief valve that's passing. This will cause the boiler to loose pressure. If its not rising above 3 bar then it's nothing to do with heat exchanger or expansion vessel.

Leak or passing valve is what you need to be looking at.

Different story if it's rising to and above 3.

Keep an eye on the pressure and see what it's doing.

hi dude, think you missed a bit, she said dripping from plastic pipe

 

[NEALDEAN]

Maybe they have run the blow off in plastic ??? What other plastic pipe would be going outside from the boiler ?
If its the condensate then it should be piped into a drain and you shouldn't be able to see it dripping ????

More info on the dripping pipe !!!!!!

Thanks

Neal

 

[gas112]

Nothing unusual about being able to see the end of a condensate pipe and being able to see what is coming out of it.

 

[NEALDEAN]

If its terminated incorrectly then you will be able to see it.

 

[gas112]

Dont talk nonsense ,terminated into an open gulley or into an external open drain it can be seen or into a gutter .

 

[NEALDEAN]

Open gulley yes, most other situations no.
Like a lot of other installers the correct manufacturers instructions are not followed.
Above water but below gulley lid !!!!
Direct into soil or waste pipe !!!!!

Anyway, don't wish to get into petty arguments.
Just saying in MOST cases if they are terminated correctly they can't be seen leaking.

if you don't want to be constructive about the post, go look at another one

I'm trying to help.

 

[gas112]

How many OPEN gulleys have lids how many hoppers have lids ,never seen a gutter with a lid or an open drain for that matter which are all to manufacturers instructions and fitted CORRECTLY.
So if you dont know what actually meets regs and instructions i suggest you find another thread to make a completely wrong comment that you would not see a dripping condensate.

Trying to be helpfull yeah you tried your best but obviously you struggle with what could be an internal leak within the boiler the guy does not mention a rising pressure then down to nothing he says it drops straight away try reading what the guy says