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I have modulated the boiler down via the pcb to its minimum output setting to try and stop the boiler overheating. I checked the CH sensor and it seems to have the correct resistances, but now when I've checked the temp on the overheat stat pipe its reading about 95°c which is way above what it...

I have replaced the secondary heat exchanger as well as the hw thermistor, which seemed to have solved the problem, unfortunately I have just found out that the boiler has some how overheated without using the hot water or heating, which I find hard to believe. Would I be wrong to think the pcb...

Thanks. I spoke to vailant as heatline are no longer around and I mentioned that and i was told it's unlikely. I don't think there really interested and they just phob you off. :wink:

Heat line c24. I run the hot water and the overheat symbol flashes after a few minutes. Boiler works fine in heating. I've replaced high limit and overheat stats and taken out the plate heat exchanger flush through with sludge remover which removed some black deposits, but the boiler still...