How to replace the Fans of X3-AELIO inverter?

When the fan is not rotating and the feedback speed of the fan is 0, the LCD screen will display FAN1FAULT / FAN2FAULT / FAN3FAULT / FAN4FAULT error. Refer to the following steps for replacement.
1. Before the maintenance of fans, the AC connection must be disconnected,then the DC switch 1 and DC switch 2 must be disconnected and wait 5 minutes till the inverter is completely OFF.
2. Loosen the screws on the right side of the inverter with a cross screwdriver, and the nuts on the left side of the inverter.
3. Pull out the fan bracket, stop at the position about 150 mm, then press the protruding block with a screwdriver to release the fan waterproof connectors, then pull the fan bracket again to pull out the whole bracket.
4. Clean, repair, or replace the fan.
5. Restore the installation of fan bracket and tighten the fixing screws.