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Can anyone help with a frustrating problem? A few weeks after new boiler/time controller fitted September 2004 - Gloworm 40FF - had problem with HW not heated; that program warmed rads only. Plumber came back, diagnosed old mid position valve as faulty and replaced it. He had difficulty with...

Thanks for the advice so far guys. There is a separate header tank for the heating side of system, above the cold water tank in loft - that seems OK. I have checked that the gate valve on cold feed to HW cylinder is fully open and the plumber did say last week that this valve was working...

Thanks for your advice Felix. I wondered about the vent pipe being blocked. However, the second time the plumber called I mentioned this and he said he had just blown through the vent pipe (?) and checked it wasn't blocked. Having looked in the loft before, I can't remember any raised...

Hello all, I have an ongoing problem with recurrent airlocks of all HW in traditional gravity fed indirect/open vented cylinder system. My previous posts below refer (hope these show correctly): //www.diynot.com/forums/viewtopic.php?t=22341...

Hi all. My post 4/3/05 12:52 refers - thanks to ChrisR for his advice so far. Problem is that ever since mid position valve replaced, we get recurrent airlocks in our hot water pipes/can't get any hot water out of taps. It is a gravity fed system, with HW cylinder heated by boiler, so...

Many thanks for the reply. The cylinder stat is new, having been replaced at the same time as the boiler. It's only set on 45 degrees and I have previously checked it's operation as OK, although my other half did get a bit burnt by the water last night before the airlock set in :oops: so perhaps...

Please help, at end of my tether :cry: System is traditional Y plan, Gloworm 40FF boiler, Grundfos pumped primary circuit for rads/immersion coil, gravity fed HW by loft tank. New boiler fitted Sep 04, great for 5 weeks then HW not heated, only CH. Company called back, said Honeywell mid...