we have no hot water,the radiators are hot and the boiler is on what is wrong?
you might have air in the lines
Your hot water to your home is ran by a hot water heater not the boiler. You need to check your hot water heater, is the pilot light lit? Does it stay lit or go out? If it does not stay lit it is probably the thermocouple.
does the boiler make your hot water ? If so does the boiler make hot water with a coil ? or an indirect fired water heater ?