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Hi Eric, If you are not getting any boiler faults coming up, I would look at changing the diaphram. thats the cheapest option and the most likely cause.. only cost around £7 for the part and doesnt take long to change. hope this helps.. Merv

Hi, I know its been a few years since the last post, but what was the outcome? My protherm 80e is going to F1 several times a day, on DHW & Heating. Many thanks