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Why would it be overheating then. Would this be air in the system.

I'm not sure off the model is old though. You say it could be overheating wouldn,t it fire up again once the temperture had fallen though. I don't think is an air lock as both the flow and return pipes to the boiler are hot when the boiler is on.

Is a room sealed potterton it is just a central heating boiler. Not a combi

Hey I have a boiler that is fireing up getting to temperture and getting all the radiators hot then goin off. It then won't comes back on again unless you press the reset button anyone no what could be wrong with it?

Thanks will it still get round most of the system with the drain off open all the time? Again thanks alot for your help

Thanks dextrous so to flush through the FE cistern do I let the system fill up til the cistern stops filling ( with the rads shut) then open drain off and repeat til water at drain off becomes clearer? Thanks for your help so far

Thanks how much are the bungs do u no? Could I alternativly just flush out through the FE system. Just letting the system fill through this then drain off repeating this a few times?

how much is a length of 22mm copper these days?

Thanks I ve got the system drain at moment so mite change it for the sake of an hour or so's work doesn't a 1600 P plus, 1800 double and a 400 double sound alot of 15 mm ?

I'm planning on flushing it though with mains adapted by a hose. Theres no airing cupboard as the hot water is fed off an gas wall heated not a cylinder. The cold feed to the system exits the bottom of the tank then runs down a wall cavity I think so can't realy get to it to cap it

Thanks I have a problem with this thou " 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. " As I can't get to the pipe as it exits the bottom of the tank. I have been suggested to use a pipe bung will these hold and how much do...

Thanks will these hold off mains pressure though?

Thanks for your replys I have been up to look at the FE tank and seems like I will have a problem isolating the cold feed to the system it comes of the bottom of the tank then straight down out of the loft and runs in the wall of one of our bedrooms. Is the any way it can still be flushed...

Thanks its just the pipework I want to flush the rads are all new ones. Am I right in saying to do this I need to take off a downstairs rad. Connect one side (the return) up to the mains via a hose pipe. Then other valve the return connect abit of copper to then a hose to a drain. And let it...

combispecialist could you tell me how to mains flush it though please thanks for any help

thanks kevindgas I can t do that in this situation cause of the pipework to the header tank begin in such a tight spot. To do it through a radiator do I attach a hose to one of the valves connected to the cold mains and turn on. Do I leave a drain off open with a hose on to a drain at the same...

Hey I want to flush out my vented central heating system. I no I need to cap of the expansion vent to the header tank and the feed to the system. Does it then involve taking a radiator off and connecting the valve to the cold mains. Can anyone telling me the correct way to flush out the system...

ok sorry thought rv35 s was the name for manual air vents . Its on the ground floor so do u think there' ll be no need for them. as the radiator it is feeding will pulll the air out?

Any thoughts or whether I need to put manual air vents in or not?

Hey I am changing some radiators on a vented central heating system. Two radiators are begin fed rom the room behind which is the cellar. The pipes run through the cellar then up verticaly about 8/10inch to the go through the wall were the pipes run about 3foot to the radiator valve. I'm just...