By default you shouldnāt need to turn the pumps on for hydraulics BLUE,GREEN,YELLOW. No lights means āAutoā
If any light is illuminated on the upper panel something is wrong. Not including the green feed lines, but everything else. Upper panel needs to be dark.
Iāve done this myself because it says āonā even tho I knew better.
Dark panel = good to go
Imagine thereās a reason to want to turn the pump on, maybe for emergencies but unsure of a reason. Iām sure someone knows.
Should probably enable the PTU pumps to at least work around it, if its indeed an error. I havenāt experienced it myself though after the update. (PTU pumps are located on the overhead panel/hydraulics systems too).
I just had this problem on my two last flights. After engines started, I had no other choice than forcing the green pump to feed hyd green. Restarted from cold and dark and same problem again. Hyd green gauge (overhead) says there is pressure, but ecam says otherwise, and confimed by several errors on system display.