Check and replace tractor convenience outlet fuse and compressor battery power harness fuse (if used).
No electrical power at compressor.
Inspect compressor wiring harness and battery harness (if used) and connectors for damage. Repair or replace as required.
Bad pressure switch.
Remove all air pressure from air storage tank. Unplug pressure switch. Check continuity across switch wires. If no continuity, replace switch.
Bad relay.
Replace relay.
Row unit down force will not increase or decrease.
Increase or decrease solenoid valve stuck closed.
Actuate manual override for increase or decrease solenoid valve several times. Remove all air pressure from system. Clean or replace solenoid valves. Shop air and tire pressure gauge can be used to manually adjust air pressure in air spring circuit until problem can be fixed.
Open circuit on solenoid wires (caution screen will appear on GreenStar™ display and diagnostic trouble code will be set).
Check and repair wiring harness.
Open circuit within solenoid (caution screen will appear on GreenStar™ display and diagnostic trouble code will be set).
Check continuity of solenoid coil. Replace solenoid.
Air spring circuit relief valve opens.
Increase solenoid valve stuck open.
Actuate manual override for increase solenoid valve several times. Relieve all pressure from system. Clean or replace solenoid valve.
Weak relief valve spring.
Replace relief valve.
Tank circuit relief valve opens.
Pressure switch stuck ON.
Turn tractor key switch OFF. With pressure in tank, unplug pressure switch connector. Check continuity across switch wires. If there is continuity, replace switch.
Incorrect down force reading displayed on monitor.
Pressure sensor not calibrated.
Calibrate sensor. Refer to INTEGRATED PNEUMATIC DOWN FORCE AIR PRESSURE SENSOR in SeedStar™ 2 SETUP Basic Planter Configuration section.
Pneumatic Down Force solenoid circuit error.
PM2 controller has detected an open circuit or short circuit in the pneumatic downforce increase or decrease solenoid circuit.
Check wiring harness and electrical connectors from PM2 controller to pneumatic downforce solenoids. Check continuity of solenoid coils.