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how to fix boiler?

ideal isar he35 combi boiler... fault code h3 no heating or hot water.. burner light coming on
eddie, August 2013
Long thread but very worthwhile reading:

http://forums.overclockers.co.uk/showthread.php?t=18443884

Blankensop, August 2013
link Click here to see other fixes for Ideal Isar HE35.