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I have a microgenus 23 that works perfect on heating but when using the hot the temperature fluctuates. It gets very hot, cuts out goes almost cold and then fires up again to repeat the same process over and over. I recently replaced the diverter valve for another problem so its not that. Could...

I have the micro genus 23 which is about 4 years old. It has started to give cold water occasionally instead of hot. The boiler fires up ok but no or very little hot water comes through. It also makes a sound like a fart when it fires!!! Sometimes the boiler also fires up when there is no...