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I have came across a strange one I can't solve.
Have been to a job probably 5 times over many months. This plumbing is original several decades old, without precious bother. The elderly couples toilet and cold bath tap stop flowing from gravity tank fed. First time I went I just quickly cleared the air lock by linking the bath hot and cold taps together with a hose for several seconds. But same thing happened again after a few months, so I checked CWT in loft and replaced the ballvalve. Everything seems fine, - ballvalve flows well, cold pipe leaves the CWT only a foot and drops down airing cupboard and then below bath. No power shower or pump exists, so no issues with tank being drained at any time.
How can a cold pipe airlock? They rarely use the cold bath tap, (as have an electric shower) so only the cold flows to the toilet regularly.
Have been to a job probably 5 times over many months. This plumbing is original several decades old, without precious bother. The elderly couples toilet and cold bath tap stop flowing from gravity tank fed. First time I went I just quickly cleared the air lock by linking the bath hot and cold taps together with a hose for several seconds. But same thing happened again after a few months, so I checked CWT in loft and replaced the ballvalve. Everything seems fine, - ballvalve flows well, cold pipe leaves the CWT only a foot and drops down airing cupboard and then below bath. No power shower or pump exists, so no issues with tank being drained at any time.
How can a cold pipe airlock? They rarely use the cold bath tap, (as have an electric shower) so only the cold flows to the toilet regularly.