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This 6 year old boiler has started to supply hot water with fluctuating between about 40begC and over 70degC. The diagnostic test using its own Appliance Control Board says the Plate heat Exchange snsor is faulty. i can't find this as a listed part. Does this sound like the likely fault and does...

It's integrated and over ten years old. It's been chewed by rats and I've had to bridge wiring and pipework in the supply bundle that goes up to the "aqaustop". Now it'll work but only if I add a bucketful of water. The supply seems to work but the strange nylon network on the machine side fills...