E-500/E-400 / IPM (Intelligent Power Module) – Trane Commercial HVAC Help Center

I see these two alarms more often as an indicator of refrigerant loss and overheating the Inverter Board.
This also could be a result of the paste deteriorating or a bad install on replacing, not scraping off the old paste and reapplying new.
I have seen where the screws not tightened or not put back after a replacement or the plastic holder cracked and needs to be replaced.
Once the IPM Temp starts to rise the Compressor Hz will hold, as it increases the HZ will decrease trying to lower the IPM temp and keep the compressor running until it hits the 212F.

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