My daughter has a Glowworm Swiftflow 75 combination boiler
which keeps losing its cold fill pressure . It is initially set to 0.7 bar as specified but drops to approx. 0.2 bar over a period of time, resulting in the loss of hot water. I have checked for any
obvious leaks to no avail. Any suggestions to cure the problem would be appreciated.
go to merchants get FERNOX LS1 (or similar)
THIS IS A LEAK SEALING CHEMICAL.
getting this in the system is not easy without a pump -but you may disconnect a radiator to put it in. It won't be easy.
the fact you can not see a leak does not tell you everthing. It is possible and indeed probable that you could be pulling air into the system -ye sounds silly
I assure you I have 30 years experience in the field and 15 in the lab -- it happens - ait entrainment - more than likely near the boiler itself.
LS 1 does usually work - follow instructions carefully
dave broadbent
June 2007
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