possible diverter valve fault. Turn your heating off. Let system cool down. Run hot water, if boiler fires up but no hot water feel 22mm (larger diameter) pipe underneath boiler usually left and right hand side. If there is an increase in temperature on one of these pipes then you have a problem with the diverter valve or diverter actuator.
Curtis Lee Patrick
February 2008
howtomendit.com for free repair help, information and advice.
