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Sounds like an air lock however sometimes the foam insulation on the outside can be dropped inside before the cylinder is fitted and can eventually block pipes, however that is very rare. The way to unblock your air lock is to connect the two isolation taps supplying your washing machine...

Try phoning a local corgi engineer. If you try fix it yourself then you are breaking the law.

Like I say it is physics, not rocket science. We were taught it in first year apprenticship in plumbing. The old fashioned systems long before pumps were used were all done on gravity installed by real tradesmen. The flow pipes had to rise to the top of the building then fall all the way back to...

Any success?

It's all to do with physics, hot water rises to the top and as it cools it then falls. If you connect the pipes to the two top tappings the water as ricarbo says will only heat the top. It will take the easiest route which is across the top of the rad. School rads were fed with flow from the...

Matt, you have not wasted your money at all. You will have bought very good quality products from Plumbs, that will last a long time. I've tried other sources for products and find they need replacing after 18 months as they are usually of inferior quality. How much did you pay for your solder...

Try venting the pump in the boiler. Same thing happened to me on 35 Cdi.

24 Ci? How old is the boiler, cannot say I've heard of a Ci boiler. Si and Ri and CDi yes but not Ci.

Apollo 30/50B. Pump stat faulty,located inside boiler to the rear on bottom right hand side. Three wires to it red, yellow and brown. No pcb on 30/50 B. Switch off power before replacing as one wire is permanently live.

Before draining down try this technique. Turn off all rads but leave the one nearest to the pump on. Shut the by-pass while you carry out this job and re-open when successfull. Select ch only and hw off, and see if that rad warms up . If you can then go and turn on the next closest rad and turn...

When you say you installed a Y- plan pack were you replacing an existing Y-plan that had gone faulty or were you installing one for the first time to the system?

If you put a thermal store or an unvented cylinder in your loft then your joists will need serious upgrading and doubling up as you are talking about a lot of weight in one of these units when full of water. On a 210 litres unit the water alone will weigh 210kg then the unit itself about another...

Thanks for your kind offer Paul, I have already been given the correct Worcester part by an engineer a couple of months ago for the Ri but could n't find it in the van last night as it was pitch black and torch was failing. As usually happens, went to my van this morning, first thing I picked...

Spoke to Worcester and it would seem I have answered my own question in that the latest Worcester boilers are sensitive to low voltage returns. The cure is to install a 0.47 microfarin capacitor between LS and LR on the terminal block. This blocks out voltage leakage from cables and will...

Just fitted a Worcester 40 cdi combi today and was doing usual installer checks for commisioning. Noticed that heating was still on even though room stat was off. Checked switched live on honeywell stat (240v) with neon tester and showed dead. Checked live return on boiler and again showed dead...