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Sorry for the bump, hoping to look at tomorrow

Edited: see above

Had some good advice on here a while ago and hoping for some input again. Needing to replace my parents faulty wireless thermostat. They have a seimens RDJ10 which I am going to replace with a Honeywell CM921. Both Boiler and thermostat L&N come off the same fused switch. I have looked at...

Thanks for reply. A bit frustrating though and disruptive but not much choice. Got back from work tonight though and there was a smell of gas in the street. Called SGN out and the guy said there is a leak at the T connection in the road, so they may decide to cut off the supply tonight...

Apologies if this is a stupid question. Have a bit of a mare with SGN. They sent standard letter last week saying they may need access to my property to carry out some work. I spoke to the SGN project manager yesterday who said there was an issue with the pipe in my neighbours garden and...

Hopefully last post on this particular subject, fingers crossed Vaillant guys replaced main heat exchanger and pump today and seems to be a success. Boiler seems quieter than what is was before the problems started? Engineer checked water quality and said there was nothing he could see...

Quick update. Vaillant engineer arrived, decided within 2 mins that new heat exchanger and pump required. Guy back tomorrow to fit parts. Hopefully that will resolve the problem, certainly a lot of money he reckoned about £800 worth of work. He thinks it is likely that water quality is...

Is there a prize for predicting the correct fault :) I am guessing the BG guys are passing the buck in case they fit an expensive part that doesnt solve the problem, I wonder whether they have targets to hit. The BG Engineer has just not filled me with confidence and restricting the cold...

BG just left Engineer and senior engineer were here for over an hour but are stumped. Spoke to Vaillant helpline and they thought circulation issue but according to the guys the noise is higher up. :?: They checked heat exchanger which seems clean, boiler has copper pipe not rubber hoses...

Unfortunately still waiting for BG to arrive, someone had put in the system they had attended site and solved the problem yesterday, which obviously they did not, only found out when I phoned as they had not arrived! To be fair to BG they have been very good with me in the past but this...

Thanks for the reply and clarifying I was not suggesting the pressure was causing the noise problem, just trying to check if a safety issue or not

Thanks for info So the pressure at the meter should be 20.5 then if it is 16mb at the boiler. If it higher than this, say 23mb would I need to consider at increasing the incoming pipe? Can't say for sure if there is 28mm coming in at any point can only see 22mm before going behind a partition...

I downloaded the MI from the Vaillant website this morning and they are certainly newer than the ones I got with the boiler. The figures min max pressures at the test point are 15 - 23 Bit confused now though, does it look like I have pressure problem or not? The BG engineer is due shortly...

Oops didn't intend to start a debate and hopefully my earlier post makes sense and my conclusions are correct. Will see BG tomorrow and see where we are then

thanks for comments bolshy did a couple tests tonight and calculated output using method in FAQ's firstly ran bath and two other taps in the house and got 37kW which is bang on boiler rating Second test I had bath running, living flame fire and burning one of the rings on the gas...

Also your previous comments "If it's gas pressure is 15mb when operating, and it's not achieving within 10% of it's rated output, (33.3 kW) then it's substantially under-gassed and is an "at risk" appliance" How do they check what rate its burning at so I can ask to see it, is the 33.3kW the...

Thanks for your input May not be correct with the 24Kw, his writings not so good. I have uploaded picture of his note. The boiler has been serviced twice by BG since install where they are supposed to check gas pressure, plus also 2 further engineers in last week where they have checked...

Bolier noise

Thanks for comment. I would say noise not as bad as it was before, his work notes say he has replaced the fan. They say readings are all normal, as follows:- 9.2% CO2 0.0009 ratio 580/665 = 24.72 Kwatt (not sure about this bit his writing not so good) He did make a bit of an issue at...