Have a problem with my boiler, its been ok for the three years I have had it, but lately when I have a shower the upstairs radiators heat up even though the thermostat is set to off. the shower and hot water are working fine, as is the heating when called for from the thermostst, anyone got any ideas please

Michael Rice, April 2011

probably the divertor valve needs repairing the shower is causing a lot of resistance to the h/water flow and is opening the divertor

brian, April 2011