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Yes there is a TMC factory set st 50c. Big sticker on it saying do not adjust so I've never touched it

Thanks for all the replies so far guys. So I checked the expansion vessel this morning. Seems OK. Static pressure holding at 1Bar. PRV hasn't dripped since yesterday and I've been checking the pressure gauge regularly and it seems steady (about 1.2 bar and goes up a bit after hot water store...

Hi, I've got a Grant Vortex Pro combi installed in 2017. I've just noticed that the out let pipe from the PRV is dripping. I've had a plastic bag over it to see how much it is dripping and I would say its a couple of teaspoons over the past 5 hours. Central heating hasn't been on since...

Thanks for the responses guys. Just as an update: I have had the central heating off for the past few days and the air in the store has been expelled and the boiler is behaving itself. I think that some air in the central heating made its way to the store after it came on for the first time...

Thanks Exedon. That is interesting about the newer models. I've just looked at the manual on the Grant website and can see the new version has several manual vent points now! There still seems to be an AAV on primary heat store on the new model. Is it possible/advisable to change that to a...

Hi All, I posted on this subject back in 2018 and never really got to the bottom of it! But I have an issue where air seems to be trapped in the heat store/exchanger on the hot water side of things. It fizzes and gurgles, knocks and bangs in various degrees of loudness and frequency. At the...

Thanks catlad. That was my initial assumption too. It was when I was putting on the Mass Loaded Vinyl I started to think twice. Perhaps I am over-thinking it.

Hi, I have been slowly upgrading a converted loft in my victorian semi. A couple of years ago I replaced the insulation in the rafters with PIR board. 100mm in between the rafters, 25mm underneath the rafter. 50mm gap between insulation in the rafters and batten for ventilation. At the...

The boards are being laid at right angles to the joists but there is no way to align the boards so that the end of the board always lands on a joist. Even if I use an off-cut of board to start the row, there is no way lay the next two boards so that the end of each board can butt together over...

Hi All, I am currently re-boarding my loft after lifting old chipboard to put down insulation. I am using 22mm P5 T&G Caberfloor boards. 2400mm x 600mm. The floor was previously strengthened and levelled by running 3x2 joists at right angles across the top of the existing 4x2 joists. The...

Thanks Bob. Just to confirm, do you mean completely remove the AAVs and then put the old AAVs back on after filling?

Hi All, I have a Grant Vortex Pro Combi 26 which is generally performing well but has a strange problem with a gurgling/fizzing/knocking noise when the Direct Hot Water pump is circulating. The central heating side is all nice and quiet. At first I thought the hot water was being over-heated...

I found that by getting air into loft by moving the insulation back from the soffit area worked. Its been just as cold as it was last winter and I've had zero problems this year. So I guess what I'm telling you is that you need to check the ventilation in the roof - if you cant make some...

I too have had success! Took a look up there yesterday and it is starting to dry out nicely. Am going to put the insulation back but cut it to size so that the eaves dont get blocked up again.

There has been snow and Ice on the roof - as it is the cold side of the house it doesnt get a chance to melt off at the moment. The condensation has coincided with the bad weather. I think that ventilation from the soffits should be the cure as although the condensation hasnt gone yet ( it...

datarebal, you seem to know your stuff. Is there any problem with increasing the ventilation in the roof and essentially treating my breathable felt as if it was a non breathable felt?

weaviestevie - My felt has just a load of white gridlines on it, have been trying to look for images on the web cant find any clue as to what brand it is - does anyone know? I dont have any specific vent holes but do get a breeze coming through the soffits. When the roof was finished I...

Hi Guys, thanks for the replies. I've got the full 270mm of insulation; 100mm between the rafters and 170mm over lapping at right angles. The room below is really quite warm considering the radiator is never on and window is always ajar. Just to update you, I've just been in to check the...

In October I had the roof replaced on my victorian terraced house (new breathable felt, batons and synthetic slates). I have a small loft conversion set up with dwarf walls with crawl spaces into the attic space at the front and rear of the house. This was in place before the new roof was...