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Why would the gas valve pressures change? and what are thermisters? Steve

Any idea how much the dhw heat exchanger costs please? Is it possible or viable to get non original parts? Steve

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...

Thanks for that. Would a diverter valve service kit sort it or is it better to replace the whole valve? Is the valve the same from a 32mffi as someone has a new one for sale cheap!

When I say it farts, it's more of a buzz. No fault codes come up at all. I have noticed that when the hot water goes cold and the boiler is running then the heating pipes(one of them) get hot so the heat is going somewhere.

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...