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why is my isar combi boiler is flashing l 9?

why is my isar combi boiler flasing l then 9 ,my heating is not working

simone
September 2012
Heating, Home Heating SystemsBoiler Flashing Heating
L9 refers to boiler overheating
''heating not working''
does the hot water work?
could be PUMP or lack of water pressure

Q
September 2012

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