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Mend He 24 Error Code

he isar he 24, error code HN?

just had pcb fitted and worked fine for a week but now showing code HN. i checked trouble shoot, says check wiring to boiler, that seems to be ok.

babs199
December 2010
hi im having the same problem did you find a cure

phil
May 2011
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Mend Heating, Home Heating Systems
Mend repair fix home heating systems