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what does f40 and f30 mean?

boiler was working night before,went to have bath no hot water. boiler is on bar is on 2 but the temperature stays at 21. the boiler is not firing up. then f40 and f30 came on when i pressed the reset button. .

kimberley
September 2007
F30Heating, Home Heating SystemsBath Hot Water
give us a clue. What boiler make and model is it!

mrgas
September 2007

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