I have an older CH system whereby the radiators are pumped and hot what is gravity fed - including the small bathroom radiator (which is on the hot water circuit & and sited next to airing cupboard).
Recently this gravity fed radiator has been getting cold at the bottom and part-way up the middle. The odd thing is that the inlet / flow pipe feels hot to touch but the section of the radiator immediately around where the inlet (hot) water enters the radiator is cold, which begs the question how is the hot water getting up to the top? The outlet pipe is barely warm.
although this is an old system, the radiator in question was replaced about 3 years ago, I flush the whole system every year and pour in fresh Fernox inhibitor every year, so would be concerned if it was a heavy sludge.
any help appreciated
Recently this gravity fed radiator has been getting cold at the bottom and part-way up the middle. The odd thing is that the inlet / flow pipe feels hot to touch but the section of the radiator immediately around where the inlet (hot) water enters the radiator is cold, which begs the question how is the hot water getting up to the top? The outlet pipe is barely warm.
although this is an old system, the radiator in question was replaced about 3 years ago, I flush the whole system every year and pour in fresh Fernox inhibitor every year, so would be concerned if it was a heavy sludge.
any help appreciated