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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
give us a clue. What boiler make and model is it!

mrgas, September 2007
link Click here to see other fixes for Worcester Bosch Greenstar.