Status
Unit will fold-back (Slow down) compressor and attempt to cool the drive. If it folds back to lowest speed and problem is still present unit will shut down after 3 attempts.
Description
PIM (Power Inverter Module) temperature is high and unit is folding back in an effort to allow the PIM to cool.
Expected Operation
If the PIM temperature is too high, it will fold back the system in an attempt to cool down drive.
Cause
1. Condenser dirty.
2. Heat Sink on back of drive is dirty.
3. Outdoor fan running too slow.
4. Heat transfer paste within drive is not allowing heat to be rejected by heat sink.
Solution
1. Clean condenser coil
2. Clean back of drive where heat sink is.
3. Resolve slow outdoor fan.
4. Replace Drive.