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Agile, Just spotted your post. The valves a V4043B1257 as mentioned above. It's usually open. It has no manual lever probably because of it's intended purpose but that's not important I guess.

So I just did it and it worked! I realised that the orange is 240v as it powers the pump, logical I guess. I'm expecting the rads to get hotter due to the improved modulating of the boiler which was previously confused by the hot flow slipping straight into the return without going through a...

Hi guys, So after a gorgeous summer I decided to to the unusual mod to my s-plan and as previously mentioned I have fitted a v4043B1257 usually ope valve on the by pass! I now need to wire it up and due to my complete incompetence with a multimeter I thought I'd ask you guys the question...

I've got to cut some rolls of coconut matting along the length and neet to protect the cut edges from freying (hope the spellings okay). Due to cost of sisal or linen binding tape and effort requires to hand stitch, I though that pumping the edges with clear silicone might be a fast and...

That's a good point! Let me explain. Last year i was struggling with flow temparatures not getting high enough. At the end of my episode of enquiry (the thread of last year) i brought an engineer in who told me that my gas valve in my boiler was faulty. Since then the whole system has...

Having read the grunfos literature (thanks for link) it seems my reasoning is valid and the recommendations about bypass settings can't in reality ever compare to shutting the bypass down during boiler run time. I have the alpha 2 l which I don't think has the same brains as the alpha2 and...

Oh yeah that's what there called! Well i think im going to try one out. I think that i will move the HW valve to the feed of the cylinder and fit the bypass normally open valve to that feed (at a T-Junction of course). I guess ill have to put a one way valve in to ensure the HW flow doesn't...

In principle i get what your saying, but i cannot find a setting on the bypass that doesn't let any water through and then open sufficiently when overrunning. The issue is probably further complicated by the pump being one of the fandango ones that reduces flow speed based on pressure at the...

Also my boiler has a requirement of 25L per minute whilst in overun which is currently served by a 15mm bypass with a taconova flow setter installed. Would IYO it be necessary to change the bypass to 22mm or would a 15 to 22 increaser and reducer within the 15mm pipe surfice?

Thanks Stem, that was the most perfect reponse. Great to hear that someone else has done it before. All my rads down stairs are on constant open so should be okay there. Dy you think it makes much difference to bills, efficiency etc etc

Hello, I' thinking of connecting a usually open motorised valve to my bypass. The idea is to stop the hot flow passing into the return while the central heating system is on which would affect the modulating of the boiler and lower the performance of the HW system. Am I a genius or a...

Here's my dilema, I have bolted together two 6x2 pine timbers to essentially make 1 6x4 joist. The precise width is 94mm combined. I need to secure this joist perpendicular to the house on an external wall. For this, so far, I have bought a joist hanger which can be secured to the external...

I haven't the thermostatic head on both sides but the valves on both sides are the ones with the push down pin. I get that is is uncommon but when your buy trv4's from b&q the come with two valves the same. I guess it's so you can move the thermostatic head to either side depending on which...

Okay so I promise the answer tothis thread isn't as simple as bleading the rads! Having balanced my rads and installed a auto pump which delivers a constant pressure on the head, I now get my bedroom rad that gurgles. There is definately no air in the system and the noise appears to be...

Mr boiler repair man saved the day. It turns out that the gas valve was faulty. Flow temperatures are reaching 82 now! Thanks for everybody's help.

Okay, so i've just paid booked a repair and care plan with WB. They'll send one of their pro's to fix on saterday then cover me for a year. Can't afford a £170 service as well but i would hope that it will be fine once the boiler's been repaired ( this will probably bite me in the a** also)...

The guy who came around this morning was an installer recommended by WB. The guy who fitted my boiler was a corgi registered plumber though probably not a boiler fitter. If a WB installer can't work it out and WB are washing their hands of it then i'm going to have to buy a new boiler and...

The one which is supposed to be under 200 ppm. Carbon dioxide i think!

If by cycle you mean the fan goes quiet and it burns less gas then yes it does that when it reaches about 55 degrees. I think the primary thermo might be faulty so i plan on changing that as it's on £15 or so. On the co2 level problem, worcester bosch are claiming that it must be the gas...

So this morning i had a worcester bosch registered installer come and check my boiler over due to the low flow temperatures. It transpires that my boiler is a 15ri which could be underpowered given the old stype 4 colmn rads i've installed and the large water volume of them. After checking...