why whan the hot water is on the heating gets hot too is it the Diverter valve thank you mick

mick burton, September 2010

yes the diverter valve is not closing when u turn on the hot water as it should shut the water flowing to the rads and make the cold water warm it looks like its not shutting properly but some times it can also be a faulty pcb which controls the diverter valve good luck

kash, September 2010