Central heating boiler losing pressure (again)

NSG666

Granny_98 said:

NSG666 said:

Unless there is the right access (rare) it's not possible to replace the expansion vessel in that WB boiler without removing the boiler entirely from the wall. Not a quick job which is why the replacements are usually put external to the boiler.

Given the 5 week time lag it seems that the expansion vessel was merely repressurised and it then lost it's pressure over the following 5 weeks. From then on every time the boiler heats up it (the heating system) over-pressurises and forces water out of the safety valve. Pressure drops, you top up, repeat....

It sounds like you use the original installer for servicing so call them about the problem and see what they say/suggest. If it is the expansion vessel or boiler that's at fault you don't want to be paying but if it is a leak then it needs finding and sorting.

Expansion vessel was repressurised on the first visit, he was here approx two hours 2nd visit, and the pdf I received after 2nd visit says EV was replaced. There is atleast 60cm height above the boiler if the flue is removed as it is a tall room, though engineer did say about the boiler needing to be removed on first visit. Engineer refused to wear a mask so I stayed in another room and didn't witness his work

Ah ok but in your 1st post you said EV "supposedly replaced" and you implied he'd not been that long on the 2nd visit.

KittenChops

This may be completely irrelevant but just in case it's not, see my post here:
https://forums.moneysavingexpert.com/discussion/comment/78806265#Comment_78806265

Granny_98

NSG666 said:

Ah ok but in your 1st post you said EV "supposedly replaced" and you implied he'd not been that long on the 2nd visit.

Because I could hear him and he spent a long time on the phone , 1st visit he was "there" 2 and a half hours but wasted a lot of time sat in his van blocking my drive. He also gave me the impression it would be an almost all day job, but he didn't spend all day on it. What he did, and what is on the worksheet is up to him and his conscience

Granny_98

KittenChops said:

This may be completely irrelevant but just in case it's not, see my post here:
https://forums.moneysavingexpert.com/discussion/comment/78806265#Comment_78806265

Boiler serviced every year by installer (otherwise warranty would be void) Gas supply was installed in 2002 by British gas with new meter, only have gas boiler (6 radiators) and gas cooker, small bungalow.
No other form of heating

Bendy_House

KittenChops said:

This may be completely irrelevant but just in case it's not, see my post here:
https://forums.moneysavingexpert.com/discussion/comment/78806265#Comment_78806265

Your issue sees to have been about the gas supply pressure, and not 'system', so sadly not relevant to this problem.

KittenChops

Bendy_House said:

KittenChops said:

This may be completely irrelevant but just in case it's not, see my post here:
https://forums.moneysavingexpert.com/discussion/comment/78806265#Comment_78806265

Your issue sees to have been about the gas supply pressure, and not 'system', so sadly not relevant to this problem.

We'd had someone else look at the boiler a few days earlier because the pressure kept falling & he said it was an issue with the expansion tank, so although it may not have been of use to the OP (newish meter), it may help someone else out. 

Bendy_House

Granny_98 said:

NSG666 said:

Ah ok but in your 1st post you said EV "supposedly replaced" and you implied he'd not been that long on the 2nd visit.

Because I could hear him and he spent a long time on the phone , 1st visit he was "there" 2 and a half hours but wasted a lot of time sat in his van blocking my drive. He also gave me the impression it would be an almost all day job, but he didn't spend all day on it. What he did, and what is on the worksheet is up to him and his conscience

I have read (on here) about certain WB boilers having their EV's located at the back of the boiler, so necessitating a boiler-off-the-wall task to have it replaced. That sounds quite major, but I can see it actually being less involved that swapping some internal parts; isolate all pipes at the bottom of the boiler, disconnect wiring, disconnect flue, and lift the darned thing off...

Mind you, isn't lifting off and replacing a boiler a 2-person job? In which case, did this person actually replace the EV as claimed?

(But, I don't know if the EV is behind the boiler, and if it is a 2-person job.)

In any case, a faulty EV being responsible for the pressure loss would also require the pressure to soar (as it would) and for the excess system water to be dumped out the discharge pipe - which it seemingly wasn't.

Because you haven't collected any water in the 'copper' plastic bag, this unfortunately remains a mystery to me, Granny. :-(

Bendy_House

Oh, if when you get them back (well done for keeping the warranty going   ) they say it is a faulty EV and want to fit an external one, suggest that they first cover this EV with vaseline, because you will be sticking it where the... ('admin deleted...')

Granny_98

Bendy_House said:

And are you up for turning a couple of valves if it comes to it? The boiler is shut off at night - power fully off - and the F&R valves given a quarter-turn to close them. If the pressure still drops, the leak is from within the boiler. 

I've found the valves so I am trying this tonight (1/4 being 90°? ) Monday I will be back in touch with the installers to investigate - I want two new radiators fitting and a new kitchen ASAP and this problem is delaying everything! I don't want an expensive flooring down if it had to be ripped up in a short space of time, manifold for the radiators is under the kitchen floor

[Deleted User]

If your boiler has a 10 year warranty and it has been serviced regularly then I would be asking WB to resolve the issue. They have their own team of engineers and they carry most parts on the van. I called them out to my boiler last year and they happily replaced the fan and the syphon. The service visit cost me nothing.