AB350 Gaming ITX CHA_FAN1 not working

wino wrote: The CHA_FAN1 header works - that's a fact :) The other fan connected to it works and the water pump connected to it also works: "What's more, the "W_PUMP" mode is IMHO really useless because it pumps at full speed all the time" - these are your words ;) So I suggest connecting the water pump to CHA_FAN1 with CHA_FAN1 mode (not W_PUMP due to your preference) and the BeQuiet Silent Wings 3 fan to CHA_FAN2. If this does not help - try other settings (silent mode, full speed mode, customize mode, etc.) because everything indicates that the connector is working properly. You can also try connecting one fan at a time to find the cause.

Thank you very much for your message.

While your suggestion to connect my water pump to CHA_FAN1 is a good idea (although not easy for me because of how difficult CHA_FAN2 is to get to since I have installed a full motherboard waterblock), I would like to share a finding I just made which seems very odd to me :

So my motherboard is set to PWM Mode for CPU_FAN and for CHA_FAN1.
However, I pulled my multemeter and measured :
12V between the yellow and the black wire of a fan on CPU_FAN
Only 5.85V (let's call it 6V) between the same wires of the same fan when I connect it to CHA_FAN1.

That seems really weird to me, and makes me think my motherboard is perhaps kind of mixing PWM and DC modes... What do you think?