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3 without a doubt. Did you measure the radiators and do a rough kw calculation? what you need to remember is that it very much appears like you are not living at the house so the house maybe being allowed to get cooler than what it would in the real world. You don't have a very large system with...

Thanks I can sleep at night now :-)

Dan you have lost me there, have I missed a joke or do you know something about setting this boiler to 11 does it do something magic? Tks

has to be on 3 with this boiler

Also remember that when you calculate the radiator kw from the btu's the figures are rated at an 75c flow 65 return so the outputs will be a little bit less so dont go rounding up especially as you are fettling the system

BTW forget about the cylinder at the moment I think you will struggle with this boiler with what could only be a 3kw coil. See if you can get the heating working with what you have and then you could change the cylinder to a range ultracal that has a much larger coil so will likely reheat on the...

Change pump but also check the loft to see if you are pumping over. You only have 6 rads, get the sizes and note if double or singles and work out how btu's they are from an online stockist and set output to that. That pump you have will not give the required flow that the boiler needs.

pipe layout issue/restriction. if it is doing that then corrosion will occur and it needs sorting before going further.

Look in the loft see if water is coming out the hooked pipe leading into the smaller feed tank. Pump will got hot

BTW the magnclean wont hurt the system but if money tight then maybe better to spend it on a pump? All pipework is new check in the loft that you are not pumping over in theroy if dossed with inhibitor correctly then you should get minimal corrosion if any. What cleaner did you get?

you may not get an s53 in the real world as you have called for heat when there would have been latent heat in the heating coil as no draw off. Modulation is where the boiler gradually decreases its output to prevent cycling. So cylinder is fairly new but may not be quick recovery so the coil...

Ok so is there a gate valve on the cylinder pipework? When you called for HW had the boiler already been on ie flow temps quite high and then you turned the call for heat from the wall stat to off, so MV shut off the CH from the boiler then would have shut down as no call for heat but then the...

Whats wrong with the above? We are trying to help remotely maybe we can calculate flow through the boiler if we get some data? Rather than just it is not working

just do what we have said, and report back. 15/60 decent pump normally required as well but maybe see what happens with d.0 and d41 and d42 before getting too involved. What were the pipes like that got ripped out ie sludged or not what was the manifold like on the microbore. If things not too...

Heat exchanger could be a bit blocked the waterways are very narrow. You only have 6 rads so set d.0 to 9. Also make sure the pump is set to number 3 and also balance the radiators. Try d.0 on 9 first and report back. Whilst in there set d.1 to 10 as well. During the heat up look at d.41 flow...

Why not set the flow on the boiler so cylinder stat doesnt get satisfied thus not having this stored hot water above the "Normal" Hopefully by now fixed anyway rather than having it parked in the mid postion

What make and model is the 3port maybe you can just change the head? Or if the heads are not available then perhaps just a case of the microswitch is faulty rather than a mechanical issue. Or could be the syncro motor

Is this s plan. Anyway iirc you have a megaflo so the supplied 2port should be blocking flow to the heating coil when no call from the stat. You sure you havent got a wiring issue maybe valve is opening when CH is calling. Just turn off HW generation and let CH call and feel the coil pipes on...

Yes we need to see it to give an opinion. I have seen a so called professional installation where the discharge pipe went into a condensate pump!

Ok and is this 15mm pipework or smaller, can you see if the pipe runs are 22mm teeing off to 15mm like it should be. Or maybe someone has been a bit naughty and piped them in series which will cause issues