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Mend Isar M30100 Heating Pcb Error

another ISAR M30100 question?

Had error that PCB faulty - replaced with new one, jumpers correct - but still wont start - Display comes up with 5 followed by c then d. Does anybody know what this means

roman
November 2010
IsarIsar M30100Heating, Home Heating SystemsHeating Pcb Error

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ISAR M30100 Error 5C/5D - Help!