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Whats wrong with my Ideal HE30 boiler?

My boiler (Ideal Isar HE30 combination ) shuts down with fault code L "F" occassionaly ( 7 times in the last 3 mnths) and this happens when I open hot water tap while the heating is on.This appliance is only 2 years old.Does anyone have any advice please.
PBNewcastle, March 2009