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2 days and the boiler is working fine! 15 quid for a new sensor.Not often boiler problems have such happy endings!

I checked the ntc's and the flow one was reading very low resistance to earth. I have just changed it and the boiler is running.. I will keep you updated.. jim walton

This morning the boiler was not working. The fault code was F64... I turned off the supply and then switched it back on and the boiler worked ok.. After my shower I pressed + and - together and the fault code showed SF.H I can find no reference to this code........Any ideas...