[donald]

hello,
wall mounted boiler had several problems ie you reset the boiler as it seems to overheat.
then works for a while then does the same thing
someone came and said you need a particular radiator on so system will work so that was ok.
but what we trying to do was to just have one radiator at a time.
so someone else came and said the return valves were off. so they have turned them on.
then turned the radiator off.
can anyone help.
it would seem that this system does not need a bypass
totally confused thanks.

[petej]

Sounds like either you have not enough flow through the boiler, the boiler stat is letting the temp get to high (normally 82 degrees C max) or the over heat stat is faulty and tripping off to early.