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 |
Go to step 2 | Reconnect the harness. |
| 2 | Replace the suspected part |
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 |
Contact Epson local service representatives. | End |