Conext SW Fault Code F57 F58 - FET1 Over Temperature

I have a small cabin utilizing a 100% off grid solar/generator/inverter setup. It has been working well for many years but recently ran into a problem with a fault code on our Schneider Conext SW inverter.
The F58 FET1 Over Temperature fault code is preventing the inverter from operating. The fault is intermittent and does reset, but will come back sometimes in minutes, sometimes in hours, and has comes on immediately upon system startup when the inverter is cold. ambient temperature is 4-6 deg C at our last outing.
If the inverter FET's are running hot, this might imply a heavy load and the inverter running hot, but were running a few LED lights and still had a problem. Has anyone come across this fault and/or resolved the issue?
Thanks in advance.
The F58 FET1 Over Temperature fault code is preventing the inverter from operating. The fault is intermittent and does reset, but will come back sometimes in minutes, sometimes in hours, and has comes on immediately upon system startup when the inverter is cold. ambient temperature is 4-6 deg C at our last outing.
If the inverter FET's are running hot, this might imply a heavy load and the inverter running hot, but were running a few LED lights and still had a problem. Has anyone come across this fault and/or resolved the issue?
Thanks in advance.
Comments
They typically use 10k thermistor although there are several different temp coefficient profiles.
The replacement was easy with a similar computer fan. Lasted 6 years in daily use until I replaced the inverter.
Prosine fan replacement, Would you...? — northernarizona-windandsun (solar-electric.com)
- Assorted other systems, pieces and to many panels in the closet to not do more projects.