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Take out the pump and connect the hoses to either side. Cap of the vent to the F+E tank. Cut a gate valve in on the cold feed coming from the bottom of the F+E tank (and turn it off) to prevent backflow. Open up any moto-valve manually (into the fully open position) Close the bypass (...

Im working of memory now, but its definaetly an unvented cylinder, i believe its a santon. I dont believe its the best installation because it is being fed from a tank in the attic. He just wants to know because he is a pain like that and asked me , but I couldnt quite get me head around the 3...

Hi

Great Comment Wet5park! Totally agree. :lol:

hot water unvented cylinder :!: don't put a combi in that size house!! :lol:

Are you sure its deffo a blocked pipe? Could it just not be air.. and your plumber is taking you for a ride? Turn off every hot radiator via your thermostatics/lockshields and leave your cold one open on max. Still cold? Blockage Gets hot? Sorted!

Valliant for me! :mrgreen:

Probably your Central heating pump. How old is it?

OK try this. Turn off both the valves on the cold radiator.. and slightly loosen of the nuts and drain the entire radiator water into a little dish. Ok, now you can take off the radiator.. Put a bucket next to both the valves and slowly open them.. are you gettin water through them...

Buy a decent ball valve from Plumb Center. Plastic torbecks are always failing. I'm guessing you have hard water where you live?

1) Try turning off all your other radiators, with your heating on and see if the rad then gets hot (it might just be a balancing problem.) If not... 2) Turn off both the valves to the rad and drain just the rad itself using a small dish.. then open up the valves and see if you have...

A basic practice means that the TRV's have only got to be fitted to the bedroom radiators. You do NOT have to have them on every radiator.

Look into it in a bit more detail and i think you'll find I'm right :)

Call a heating engineer. It's impossible to diagnosis from what you have said.

http://www.diynot.com/forums/viewtopic.php?t=96919 ... There was an on-going argument on the above URL about this. However, I've always used them and never had any problems. They look alot neater than a 1/4 turn valve, etc. So, my personal opinion is use them :) ... but some may say not?

Plumber 3 is correct. Although common sense is to do as plumber 1 says. Plumber 2 is probably old school and not quite up to date on his regulations.

Before you do anythin to drastic, try two things. 1) turn your pump speed down. 2) raise your vent pipe abit. ... You should not have pumping over as this causes potential blockage problems in the future because of deoxgenation.

I'm afraid its new radiator(s), unless u can get the nipple out with some long nose pliers.