my radiators heat up when i only have the water on, i have a valliant boiler, not combi . iv tried bleeding them but doesnt seem to be making any difference. this has happened a couple of time in the last year but righted it self, but seems this time, its not going too,

molly, May 2009

faulty 3 port motorized valve.may just need the synchron motor inside replacing.call in a plumber or gas engineer to take a look for you.

john the gas, May 2009

motorized valve sticking

b, May 2009