T922_O: PIM Temp Foldback
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 21 times.
The drive will attempt to fold back if the PFC or Power Factor Correction Module in the drive begins to overheat. This overheating could be from a grossly overcharged system or from a failed outdoor fan motor, dirty condenser coil or dirty heat sink on the back of the drive itself. Make sure nobody has tried to separate the heat sink from the drive itself.
If the drive's PFC temperature does not respond to folding back, or the compressor is already running at its lowest speed, the unit will shut off and will likely display a T908_O PIM Overtemp fault
