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Mend Isar HE24 Heating Hot Water Led Display

my isar he24 keeps flashing h3what does this mean?

hot water comes out hot but then goes cold then hot again and the led display says h3

sp
November 2012
IsarIsar HE24Heating, Home Heating SystemsHeating Hot Water Led Display
faulty dhw thermistor (hot water temperature sensor) download the ideal isar installation pdf online your see the pic of it

kash
November 2012

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Isar HE24 H3 Error - Flashing Light & Cold Water