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- 3 Apr 2017
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I'm house sitting whilst my son is on holiday. He has the above gas boiler. He showed me how to turn the heating on if it got cold but I messed up when I turned the heating back off. Now I can't get any hot water. All I have are flashing symbols on the left hand display. It's flashing F.75 and 0.5 and there is a C . Can anyone help please?