Cause : REPLACE FAN comes when running time of inverter cooling fan has exceeded its estimated life time. This estimated lifetime is based on manufacturer data and doesn't necessarily indicate immediate fan failure.

The code 4280 in your ABB ACS800 drive indicates a warning related to the cooling fan for the inverter module. This signifies that the estimated lifetime of the fan has been exceeded.

• Replace fan. Reset fan run time counter 01.44.