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You still havn't mentioned wether the hw LED lights up when tap is run you need to answer basic questions before looking into anything more complex.

you need to investigate why it has a auto air vent it is masking a problem of air ingress which will keep making the radiators fail, i'd be looking at converting it to a pressurised sytem,your f+e tank is probabley not got a high enough head of water between rad in loft and tank

Magnetite is the name for the sludge which is very fine iron filings that is the steel from the radiator if you leave it in a clear bottle it will fall to the bottom and water will be clear run a magnet up the outside of bottle and the filings will attach to it. The blockage will still be on...

I have quite a powerful magnet i run along copper pipework if you feel the magnet trying to stick to pipe that's where the blockage will be because copper isn't magnetic but the blockage will be steel of the rads which is

There are lights on the front of the boiler does the hot water light come on when the tap is running if it is do rads heat up if so d/v valve passing if no hw light comes on microswitch on dv valve not making,both faults point to new dv valve req'd horrible job to change your last eng prob tried...

Colour of the water also tells wether it's a air or hydrogen problem orange rusty colour is air ingress and a black water is hydrogen problem both and your buggered

It's a problem caused by the pipework blocking over the years and you have got to a point where the system cannot function it's having a heart attack. You say it's gravity hot water so your system is going to be over 20 years old so it would be better to rip out and start again because you'll...

It's your Diverter Valve the switch inside is causing the motor to stall in CH only mode only cure is replacement. Temporary solution is to take cylinder stat off cylinder then hot water will not satisfy and switch to heating only.

The best way to check the Safety Blow off pipe is to go outside where flue is coming out then about 4 foot below there should be a 15mm pipe sticking out just check if it's dripping all the time or when your Central Heating has been on for a couple of hours if it's the latter its a faulty...

Spent the last couple of weeks converting my shed/outhouse into a room for my PC/Tele/Games Console basically a lads pad out the way of the house. Anyway it's single layer brick and iv'e insulated and plasterboarded it. Now i'm onto the flooring and was wondering what best to do with it. Its...