Worcester Bosch 30CDI

Joined
2 Dec 2010
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Location
Bournemouth
Country
United Kingdom
Hi All,
I have had the above boiler for about 4years with no problems. Yesterday i came home and noticed pressure was down to 0. Scared, thinking there was a leak in the house somehwere i checked all round the house for possible leaks, but nothing can be seen.

This is a little confusing.... I read on the interenet to isolate the valves under the boiler to elimante whether the leak / fault is with the boiler or with the heating system. When isolated the valves under the boiler the pressure continued to drop, so i assumed its gotta be the boiler. Good news as i have cover for it. Called out an engineer and today he did the same thing and typically the pressure remained constant. He left saying i have a leak in the house. I tried the same test again and he seems right it did hold the pressure, odd as the previous day it didnt for me. ( Iwill tr this again)

THe problem of lost pressure does not seem consistent. Some times it drops very quickly, within 5min from 1bar to 0. But now its alot slower. Something tells me its the boiler, and this is why....

When i refill the boiler, i have to use a key and then turn the nob to re-pressure. In the past i would expect to see small amount of water come ut, but now i get loads, literally a bowl of water comes out. If i let it drain out it then starts to re-pressure? and this cycle contines.... Am i right in saying this shouldnt be emptying out this amount of water and would mean a fault with the boiler? People said to check the pipe outside but i dont get anything from it, perhaps this water discharge when i re-pressure is not going in the correct place?

If that makes sense, your very good, really what im looking to hear is , its a fault with the boiler and not a leak somewhere in the house thats under a concrete floor.....

Your help and advice very much appreciated... thank you.
 
hi, it comes out from the key literally pours out, then when its fully drained it will re-pressure. also the odd thing is, i keep checking earlier it would lose pressure completely within 10mins but now its been running for over an hour and is just under 1bar without much movment?
 
When you tested if the boiler held its pressure did any water come out of the condensate trap or filling loop when it failed the test?

If the filling loop is leaking is this part of the system tested when you isolate the boiler? No water should leak out of the filling loop!
 
hi, it comes out from the key literally pours out, then when its fully drained it will re-pressure. also the odd thing is, i keep checking earlier it would lose pressure completely within 10mins but now its been running for over an hour and is just under 1bar without much movment?

you haven't got the key fully in. It locks in place. grease it up with butter or something first! the non ret valve in these filling loops dont fail.

pressurise system to 2.8 bar then turn off the bulkheads for an hour or so. if it loses pressure during this time ( if the bulkheads are COMPLETELY closed off) then it is likely your heatcell is leaking. if when you reopen them after an hour the press drops then its on your system
 
hi, it comes out from the key literally pours out, then when its fully drained it will re-pressure. also the odd thing is, i keep checking earlier it would lose pressure completely within 10mins but now its been running for over an hour and is just under 1bar without much movment?

you haven't got the key fully in. It locks in place. grease it up with butter or something first! the non ret valve in these filling loops dont fail.

pressurise system to 2.8 bar then turn off the bulkheads for an hour or so. if it loses pressure during this time ( if the bulkheads are COMPLETELY closed off) then it is likely your heatcell is leaking. if when you reopen them after an hour the press drops then its on your system
 
hi many thanks for your reply, i just had a friend round whos a plumber and yes i didnt have the key pushed in which explains the flood !! and it does seem i have a leak and whats worse its probably in our conservatory which s only 3months old under a tilled floor, gutted, although its never leaked over the last 3months of having it - it just decides to start now :/
 

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