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Ive had the TRV completely off and blown through it and its ok. Im sure it must be this Fernox stuff :evil: Whats a header tank over flow? I have a combi boiler........... :)

Ive tried that and Ive had the TRV off to make sure its ok. Any other ideas? :?

its a reversible flow TRV :D

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Hi, I have a problem with my central heating. I have a Vaillant Combi Boiler which is 12 years old and 8mm micro bore pipes! I recently converted the upstairs radiators so they now have a TRV fitted in them.This involved changing the threaded insert in the rad and to resolder a new piece of...