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My Ideal Isar H24 boiler has a H : F flashing, what can this be?

My Ideal Isar H24 boiler has a H : F flashing, what can this be? and I reset it several time and also switched off and on with no results?
Mohamed, March 2016
http://www.mrboilerrepairs.co.uk/Fault-codes-Idea-Isar

http://www.justanswer.com/hvac/64qbd-isar-he30-boiler-fitted-new-pcb-control-panel-when-turned.html < And check the second reply.

XXX, March 2016