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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...

:D Assuhors I've solved the problem: The rats had chewed the fill pipe and I had repaired it. They had made some plastic swarf which went through the system until the spray point at the top of the plastic pipe warren. This reduced the flow so that the fill water dropped into the syphon...

Well I've blown thru the sump pip and any pipe I can find. The only thing I can think of is that the stepper motor timer thingy isn't allowing three fills before it moves on. Is this a fault anyone's heard of?

TKU Rocks1 and Leccy758. I will try that. Rob :)

OK, I follow. Facing the maching, the fill tubes are on the left side, not pressurised and with a syphon fill arrangement that should fill and empty at least three times as far as I can see. On the right hands side, the tubeways are dry/ Where do you mean by the pressure chamber?

TKU. As far as I can see, the side chambers are free-flowing and need no cleaning. The pump empties the water easily. What do you mean by the sump pipe and why would that prevent the correct amount of fill?

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...