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how can i fix it?

my ideal icos he18 boiler keeps displaying H5 WHAT DOES THIS MEAN
JULIE, May 2011
have you had the pcb replaced recently?
H5 refers to ABSENCE of pins[configuration] in pcb
i hope you still have the old pcb
its just a case of transferring pins from old pcb to new pcb
boiler WILL work then

manwithnoname, May 2011
link Click here to see other fixes for Ideal HE18.