About a half year ago we bought dozen laptops HP 240 G8. Recently 3 of them, sometimes, started to show "System fan (90B)" error during startup. If i choose boot, the fan spins with full speed, The air temperature that comes out of ventilation hole is cool.
When i searched through Google, it showed answers for old laptops where the fan just stuck, and it is needed to disassemble and clean it. But it is definitely not in this case, since it is new laptop and the fan spins without any extraneous sounds.
I also updated BIOS to last version F.21 without result. The Hardware monitor app shows CPUs temperature is quite low - around 50 Celsius.
What would you recommend in this situation?