Hello @damiii & @Flo_Schneider, Few months back, the technician replaced the motherboard again. With the new board we were able to see C1FE, but when we set code 35 (for 400m3/h and right setup) and pushed the OK button, it stored only for 3 seconds, then it returned to 50 (if I recall correctly). So we were not able to set it somehow. C1FE was not available at that time, it was not visible. Strange...
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