pilot light still on but is not fireing up?no hot water radiators cold,making a clicking noise,i can hear it switching on & off but just does'nt fire up,what could be up with it?
you need to check for voltage on the gas valve . the only things it can be are a faulty thermostat not letting power to the gas valve or a faulty gas valve which isnt opening to let the main gas through , this is the most likely problem.