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wot is the fault with my boiler?

why is my boiler (ideal icos) showing the fault code HE on the display
lee, October 2009
Pointing to a faulty PCB hold reset button for 2 seconds does it operate correctly? No turn boiler off for 5 seconds then turn back on does it operate. No Get a RGS engineer.

RR, October 2009
link Click here to see other fixes for Ideal Icos.