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PostPosted: Fri Oct 19, 2018 5:23 pm 
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Hello gas4you, Very interesting reply to the question posed. I have a similar problem on my Worcester Bosch Greenstar 30Si Compact, which is only 3 yrs old. Fitted by BG! I've already done the checks you mention. But regarding this part of your advice, "You need to pressurise the boiler then isolate it from the heating system via the isolation valves under the boiler. Leave it as long as possible, preferably 24 hrs or more without using it, then if the pressure drops you know there’s a problem in the boiler and if it holds but drops when you open the valves, you know it’s on the heating side somewhere." Can the domestic water still be used, or is it a kettle job?

Also, in my case, if I leave the boiler on Eco, the pressure gauge drops over a short time span (overnight) but running on preheat the pressure is more stable. A year after BG fitted the boiler, I rang to ask when the first service will take place, their reply floored me. The reply was that the boiler had been serviced when it was installed, WHAT!!!!! After a heated, forgive the pun, response from me, they said they would relent & send a guy to service it. Then I was offered a service package @ app £200 a pop. You can guess my reply to that. Also when I checked all the paperwork, I find that the warranty was only for 1 year. A friend who used to be in this trade when it was Corgi, said that the usual warranty is at least 5 yrs??

I'd like a comment on that also if you would oblige.

Many thanks.


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PostPosted: Fri Oct 19, 2018 5:29 pm 
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Never a good plan to hijack another thread, I've split it.

Original thread here boiler-losing-pressure-day-after-central-heating-turned-on-t95448.html


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PostPosted: Fri Oct 19, 2018 8:24 pm 
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Hijack is a very strong word to use when the subject matter is practically the same as the OP's thread.

So please explain where you've "split it" to.

Thanks.


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PostPosted: Fri Oct 19, 2018 8:47 pm 
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trooper wrote:

So please explain where you've "split it" to.


Here obviously. With a link to the original thread.

trooper wrote:
Hijack is a very strong word to use when the subject matter is practically the same as the OP's thread.


Not at all it's a generally used term in forums, the OP may well get a notification that someone has replied to his thread.


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PostPosted: Fri Oct 19, 2018 9:01 pm 
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Of course, yes. Must read replies with a tad more attention, a senior moment methinks.

I hope the OP does get a notification. But more-so, I hope gas4you spots my query.

Thanks.


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PostPosted: Fri Oct 19, 2018 11:58 pm 
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trooper, my 2p worth.
The manufacturer offers a warranty of 5 years, but the installer only offers a warranty of 1 year because they are the ones who have to come out and fix it (which costs money) so they then "offer you" a service contract.
As they say, always read the small print before you sign anything.

_---------------------------------------------------_

A suggestion, tape a paper bag (or a scrunched up paper towel) to the Pressure release pipe, check it the next day.
If it is not there, or soaking wet then that is how you are losing pressure.
If it's not wet/missing you may have a leak.

The PRV pipe will be going from your boiler to outside and to nowhere (Probably) but it will be an open end. Under no circumstances shove a paper towel up the end of the pipe, just wrap it around and use a bit of sticky tape, as mentioned earlier.

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PostPosted: Sat Oct 20, 2018 7:05 am 
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Hi, thanks for your input. I've done the flow & return valve closure test which didn't show a leak, as the pressure stayed as I'd left it the previous night. But it is a strange one this. If I run the boiler on Eco, when I check the pressure gauge, which incidentally is in the loft of our bungalow, so of late, I've been up & down the loft ladder as often as a pro's knickers! the gauge shows very low, if I run on pre heat, there doesn't appear to be a problem? The PRV pipe has been connected to the stack pipe, so today I'll disconnect it to see if there's a constant drip. Do I do this with boiler running or off? Thanks again.


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PostPosted: Sat Oct 20, 2018 8:32 am 
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I would suggest the "paper bag" idea with both boiler on and off. See if one is worse than the other.

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PostPosted: Sat Oct 20, 2018 9:30 am 
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Just been up in the loft yet again. The boiler has been on for c/h & is now off. Press gauge is showing 1 bar. When I checked it last night it was 1.5 boiler off. Doing PRV now.


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PostPosted: Sat Oct 20, 2018 4:53 pm 
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Eased the flexible PRV drain pipe from the soil pipe & suspended a smallish container to catch any water. The boiler has only been used since for drawing domestic hot water & there is a cm of water in the 10cm dia container. The pressure gauge is now showing ½ bar.
I'm at a loss to understand where to go next. If I can bottom the problem, I'd then get a boiler chappie in to sort it, but I'd like to approach said chappie with what I've tried & now what I think it might be. There's no harm in giving indicators to a tradesman.
My guess is a failure in the heat exchanger, a pin hole or such. Then again, I could be talking nonsense. :dunno:


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PostPosted: Sat Oct 20, 2018 5:06 pm 
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This may be a stupid question but are you sure the pipe you pulled out is the PRV pipe and not the condensing pipe?


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PostPosted: Sat Oct 20, 2018 5:29 pm 
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I'm not sure of my name at this present moment. There is a 15mm copper pipe exiting the outside wall roughly adjacent to the boiler location, which turns back on itself to face the wall. Looking at the boiler & pipes off it, I can't tell which section this pipe is coming from, but I'm guessing that's[i][/i] the PRV pipe. The flexible pipe that has collected the water is the Condnesate drain. Ooops! sorry.
I've turned the c/h on & the pressure gauge is now showing 1.5 ish bar.

I have never seen any fluid exit the copper PRV pipe, nor is the wall stained, which one would expect as I'm informed it is corrosive.

All your help is appreciated.


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PostPosted: Sat Oct 20, 2018 5:33 pm 
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First thing to do would be to check all the radiator valves for any weeps whilst cold. Remove the plastic covers as you may have a mior weep from the spindle.

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PostPosted: Sat Oct 20, 2018 6:00 pm 
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With the floors being solid, all the rad pipes etc are exposed, even a drip from anywhere would be picked up immediately.
Should the pressure gauge return to 1 to 1.5 bar when the system is cold?


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PostPosted: Sat Oct 20, 2018 8:28 pm 
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Just checked the container catching the condensate water. It has now filled the container which measures 10cm x12cm. With the heating having clicked off hours ago, is that a normal amount of condensed water draining off?


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