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Thanks for that. I have a gas to water heat exchanger and also a water to water heat exchanger which one should I clean (or both)?

I have a problem with my combi boiler. When you run the hot water, the boiler will turn off for a few seconds before igniting again which means you have about 30 secs of hot water then about 10 secs of cold and so on which does not make for a nice shower or a hot bath. The pressure is OK and it...