A910_O: Lost Rotor Position
On the VSODC, this fault would be displayed on the seven-segment LED as a number 15. A 15 displayed is one of several inverter faults. You will need to validate this fault at the EcoNet Thermostat or by looking at the red or yellow flashing LED's in the upper right quadrant of the drive itself
The Drive LED's will be flashing the yellow LED 2 times.
Feedback from the compressor to the drive is suggesting it is not controlling the compressor speed. Verify the U, V, and W terminals are wired correctly in the right order.
Starting from the top...
The W terminal should have the Black lead to the compressor on it.
The V terminal should have the Red lead to the compressor on it.
The U terminal should have the Yellow lead to the compressor on it.
Verify the molded plug on the compressor harness is making good connections at both ends.
Check the resistance of the windings, leg to leg to make sure they are similar. The resistance can vary depending on when the compressor ran last, how much liquid may be in the compressor sump etc. What we need to verify is that U-V, V-W, and W-U are similar in resistance.
Gross overcharging or a flooded compressor can cause any number of faults. It may be worth removing some refrigerant to the point it is undercharged to see if the fault goes away before properly recharging the unit.
There is a slim chance that the compressor is tight, but you would likely see a T901_O Compressor Overcurrent, but that's not as likely as one of the above items.
