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So, going by my diagram, you think opening the gate valve on the left? Presumably that would give the water an easier route to travel yes? What does the other gate valve do that comes off the bottom of the three port valve?

Gents As some of you may have noted, I have another thread running at the moment about my central heating. Hopefully I'll soon get the bottom of the problem and be able to find a cure. The reason for this thread is that I'd really like to buy a book that would enable me to understand how...

Gents - thanks so very much for your most detailed replies. I realise that my diagram may not have been too clear, so have taken a bit of time to make it easier to understand. Please find attached new diagram. As far as I understand things, my heating system is a standard gravity fed...

They are included on the diagram. They're at the bottom.

I've recently built an extension and added just two radiators upstairs which was reasonably easy to do. However, since we've had this spell of bad weather the radiators downstairs didn't really get warm enough and I immediately suspected that I needed to balance all the radiators. Now, I...

The felt is ideal. Thanks.

The main in our house comes in at the kitchen, and at the moment we're having a new kitchen installed. As all the units are out, I've noticed that the cold water main gets absolutely covered in condensation before it disappears up towards the loft. Is there anything I can wrap around the...

I've got a Potterton 60 which has pretty much had it. Our house has been extended quite extensively, so it's probably about time we had a new boiler anyway. My friend has a Potterton Supima 100L which he's just had removed from his house before it's refurbished. So, my questions are… 1...

My Potterton Suprima has failed, and going by what I've read from past posts on this and other forums, I think the fault lies with the Air Pressure Switch. I have now removed the switch. What's the best way of testing it? Is it possible to connect together the two wires from the switch? If...

Is it easier to test the fan or the aps? That way, I can narrow the fault down a bit?

Potterton Suprima 60 Got up this morning - no central heating for hot water, so opened up the flap on the boiler and pressed the re-set button and it went to solid red. When I adjusted the central heating timer so it was calling for heat, the boiler clicked, then an internal fan started...

I'm about to start wiring up my own alarm system. What does End of Line mean? My panel gives 8 zones as 4 wire. 16 zones as 2 wire. And also 16 zones as 2 wire EOL. What's the difference. Sorry for the question, but I'm confused?

Why an allen key?

I'm putting a couple of new PIRs on our system. At the control box end, the existing wiring has the standard 6-core cables, but it looks as though there's three pairs which have been 'twisted' together. I want to follow this look through to the new cabling that I'm going to put in. How...

Will Fernox dissolve it, or is the only way of getting rid of it is to cut out and replace the blocked part of the pipe?

Does that hard black stuff turn magnetic then?

I doubt it's been incorrectly plumbed, as it's been an installation that's been there for years, and this problem has only just started happening. My initial thought was a blockage somewhere as well. Mainly as I don't think he's ever had any inhibitor in the system ever. Do you think if we...

I'll probably go for solder then heat shrink. Where's the best place to get heatshrink from? Also, are the junction boxes from Screwfix/Tool station OK?