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Mend Isar HE 35 Boiler Heating Burner

Isar he 35 strange display behavior?

Hi
Today morning I notice unusual display showing. It is all the time altenatively "-" and burner for a second and again. No matter if the burner works (all is working properly) thanststus shows d and "-" while the burner is working.
Any idea what the boiler wants to tell me??

Piotr Synowiec
February 2016
IsarIsar HE 35Heating, Home Heating SystemsBoiler Heating Burner

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