i have tried to bleed the rad in my top room, done this with boiler both on and off, still air in system. when i turn the bleed valve usually get small amount of hiss then nothing. system is W/B 14/19cbi and have 8mm with twin valve microbore pipe, all other rads get hot, 2 downstairs are hotter at top then in middle of bottom. any ideas. Ta
air in radiator
- Thread starter lazyscott
- Start date
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sorry the boiler info means nowt to me. have we a name of boiler. is it open vented system or tank fed.?
Sorry, it's a worcester bosch, the system is vented i think as i have a small tank in the loft
has it got any water in it 
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Yes, the small tank is full, all the radiators on the g/f and 1st floor are hot. its just the one in the top room that has air in it. this is the only rad that has valves at both ends i.e on/off and lsv. i have tried shutting down the lsv and leaving the bleed valve open but nothing am i right in thinking that the first pipe to get hot should be the flow?. sorry for the rant, but i have tried every thing i can think off but so far all to no avail.
Ta
Ta
Is tank fitted above rad if not raise it if it is then suspect blockage (possibly) where cold feed joins system
Update, the rad in the top room is now cold, rest of system rads are on have tried incerting a small pipe into expansion tank tank outlet a blowing to try and create a flow but nothing happened. also the pump has started to make a high pitch whining sound?. any other ideas as to how to cure an airleak or clear a blockage.
Ta
Ta
This doesnt always work but does work often enough to be worth trying
Stick a compression or pushfiit 22mm elbow with a 22X15 reducer in it on your vent pipe.
Shove a piece of 15mm pipe into the reducer. Your hosepipe should then push onto the 15mm pipe. Turn the water on to the hosepipe and with a bit of luck it should blow the blockage out of your feed pipe.
I flush it like that for 20 -30 mins letting it overflow from the f&e tank during which time you could make use of the higher pressure and bleed any naughty rads. Get someone to keep an eye on the tank water level though just incase the overflow pipe can't cope.
Stick a compression or pushfiit 22mm elbow with a 22X15 reducer in it on your vent pipe.
Shove a piece of 15mm pipe into the reducer. Your hosepipe should then push onto the 15mm pipe. Turn the water on to the hosepipe and with a bit of luck it should blow the blockage out of your feed pipe.
I flush it like that for 20 -30 mins letting it overflow from the f&e tank during which time you could make use of the higher pressure and bleed any naughty rads. Get someone to keep an eye on the tank water level though just incase the overflow pipe can't cope.
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