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| Fault code 21123 indicates a problem with the circuit for the "increase" solenoid for the pneumatic downpressure system(if the planter has monitor-controlled PDP). Go back to the PDP valve(should be between the LH seed hopper and LH transport wheels on most planters) and look at the solenoids(the harness should be marked at the solenoids with stickers for increase/decrease). See if the increase solenoid has a poor connection/unplugged. Good luck!!! | |
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Case planter
