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I added two new rads to the system and now my old boilers burner doesn't fire up ?? Could this be an airlock ???

I have got a pumped heating system running off an old back boiler on a y plan configuration. The problem is with the heating switched off at the programmer and the stat, the radiators still get hot could this be the 3 port valve ?

After the central heating has been on for a while, when it clicks off there is a serge of water that goes up the vent pipe and into the F&E tank and it also makes a noise like air is bubbling in the system. The towel rail in the bathroom has to be bled regulary. The boiler is a Glow Worm Miami...

I have recently installed two small rads in my loft but the f&e cistern is lower than the rads. I have extended the vent pipe so it is higher than the rads and they are now getting hot but is this ok long term ? i was going to put a check valve on the feed pipe to stop it trying to push water...

It seems like we have an old system that has been modified over the years. I think it started out as a gravity system but has now been converted to an "S" plan. I am currently experiencing problems with the central heating side, when the heating clicks off there is a rush of hot water that goes...