Hi I have a old baxi back boiler that has stopped producing hot water. The system is pumped fed heating with gravity fed hot water. The heating works fine but the hot water has stopped working. I have tried my timer on hot water only and water/heating and still the same problem. If i put it on water only and turn boiler thermostat up to maximum the boiler lights and pipework to immersion tank gets very hot but after a fex minutes the boiler goes out. If i turn boiler themsostat down nothing happens at all. I have checked small header tank in loft and this is full of water. I have also tried heating water using immersion heater and this works fine. I am thinking or maby hoping that the problem is just some king of blockage but really need any advice out there. Also forgot to mention that if i turn boiler control up to maximum sometimes i get quite a blast of water come out of overflow pipe in small header tank.
Many thanks please help Damon
Many thanks please help Damon