I have a baxi 105e condensing boiler.
About 3 mths ago a B/G engineer came an replaced the diaphram, (think thats what it was called)since then the pressure has been really irratic sometime running at 3.5.
If that wasn't bad enough, everytime the hot water was used the boiler made a terrible noise (which has subsided quite alot).
But the annoying thing is, when the heating starts up, the water drips out of the overflow pipe. This in turn has started to to drip though an air vent and has started to drip inside rather than out. :(
Have had a B/G service engineer out again who tells me my system needs flushing and they do it for Â£650. :shock:
He said all the trouble i'm having was because of sludge and debris in the system, yet when he tested it the water was clear.
The whole system is 4 yrs old, does it really need flushing?? the first engineer said no..
Sounds like two problems, firstly the filling loop (the tap on the bolier with the flexi braided silver pipe) is in the on position hence the over pressure and venting over flow pipe, the system should be filled to 2-3bar and then the filling loop should be turned off
Secondly there is air trapped in the system which needs to be bleed out hence the noise, non of these mean the system needs flushing though it would be cured by flushing because the system is bleed at the end of a flush.
The reason the filling loop my be on and air is in the system is the work done resulted in a leaking joint which your plumber could not motivate him self to find and fix, so leave the filling loop on, take the money and be on his way may of been the choice of the day
Â£650 would be the cost of installing a new boiler in most instances so it sounds like you spoke to the wrong plumber best advise is to avoid such people where possible.
No it doesn't need flushing. The drips of water from the pressure relief could be a few things
a) the pressure relief valve is passing (Most likely) replacing is easy
b) the pressure is too high (should be between 1.0 and 1.5 when cold)
c) the filling loop should be disconnected - not left where it could pass causing pressure to rise.
The noise could be and is quite common on the baxi Combi's - which is the diverter valve sometimes can just be an 'O' ring needs replacing. Normally a high pitch squealing sound - is that the sound you mean ?
Condensing gas boilers have been on the market for about twenty years now. The early boilers were noisy and very heavy. Today's condensing boilers are not even remotely the same as their predecessors. There have been many improvements that make these boilers lighter, safer, and more reliable than ever.
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