Hi Singapore.
You have a lowering problem AC motors create electrical power the relationship between the two factors seem irrelevant.
Most units today with advanced electronics have a load holding solenoid or some way to secure the hydraulics in a fixed position - In your case up.
Read the schematic & determine first if you have an Electrical problem or a mechanical one.
If all your electrical is OK - then you need to find out why the pressure is being lost & the unit is lowering by itself.
More information is needed to proceed further.
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