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it usually means a chip is damaged in the controller
Materials and tools required for repair are
new chip, tweezers, soldering wire, soldering iron
When the EO error code appears on the controller display
Please disconnect the power, and open the controller
The replacement steps are as follows
First use a soldering tren and wire to remove the faulty chip from the pad
Finally, re-solder the chip to the pad
If it is firm, it means that the welding is successful
If the EO fault code is eliminated, the repair is successful