SEL1 PID reverse error / SEL1 PID lock error / SEL1 PID overload error

Error code
  • 000421 SEL1 PID overload error
  • 000423 SEL1 PID reverse error
  • 000424 SEL1 PID lock error
Occurrence condition
  • Valve selection motor cannot operate due to large motor load
  • Valve selection motor is rotating in reverse
  • Valve selection motor cannot rotate
Assumed cause 
  • An abnormal load was suddenly applied to the motor, and the motor rotated in the opposite direction due to the reaction force.
  • +42V power is not supplied.
  • The load on the motor is greater than expected.
Related parts
  • Harness polarity wrong
  • Valve selection motor (valve selection encoder)
  • Gears are locked due to foreign object
  • Mechanical Controller Board failure
  • Main Board
Troubleshooting
Step Confirmation and action YES NO
1

Check harness connection
Is the harness connecting to the Selector Unit properly connected?

Go to step 2 Reconnect the harness.
2

Replace the suspected part
Replace the Selector Unit. Does the error still occur?

Go to step 3 End
3 Replace the suspected part
Replace the Mechanical Controller Board. Does the error still occur?
Go to step 4 End
4

Replace the suspected part
Replace the Main Board. Does the error still occur?

Contact Epson local service representatives. End