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Back Story. I inherited this boiler when I moved into my house and over the past few years I've learnt and managed to keep it running by replacing the Heat Exchanger and Thermistor myself (thanks to this forum and youtube). A few months back I bled one of our radiators and ever since then when...

Hi, can anyone help diagnose a fault with a Heatline Vizo? A few months back I noticed after running hot water that the DHW led would flash on the boiler, this resulted in us having to run the hot water tap slowly in order to get hot water until finally it became hard to get lukewarm water. At...