Troubleshooting Stiebel Eltron Water Heater Reset Button

It a stiebel eltron tempra 29. Replacement type is mkp x2 1 0µ reichelt germany pin pitch 22 5mm 1 0uf 305v thanks ole. Remove the screw on the right hand side of the tankless water heater and swing front panel towards you and to the left to open the unit.

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