Operator’s manual, Hopper alarm does not sound when hopper is empty, Hopper alarm sounds when hopper is full – Great Plains PM400 Monitor Operator User Manual
Page 54: System voltage alarm

OPERATOR’S MANUAL
PM300, PM332, PM400 Planter Monitors
11001-1372-200606
48 / TROUBLESHOOTING
HOPPER ALARM DOES NOT SOUND WHEN
HOPPER IS EMPTY
Probable Cause
1. Hopper sensor coated with dirt
2. Faulty sensor or harness shorted to ground
3. Defective console
Corrective Action
1. Clean sensor using a dry bottle brush.
2. Swap harness connection with another sensor to determine if sensor
or harness is damaged. Use service screen if another sensor is not
available. Replace sensor or repair harness.
3. Console is damaged. Contact your dealer, DICKEY-john USA
(1-800-637-3302), or DICKEY-john Europe (011-33-141-192189).
HOPPER ALARM SOUNDS WHEN HOPPER IS
FULL
Probable Cause
1. Faulty sensor or harness open
2. Defective console
Corrective Action
1. Swap harness connection with another sensor to determine if sensor
or harness is damaged. Use service screen if another sensor is not
available. Replace sensor or repair harness.
2. Console is damaged. Contact your dealer, DICKEY-john USA
(1-800-637-3302), or DICKEY-john Europe (011-33-141-192189).
SYSTEM VOLTAGE ALARM
Probable Cause
1. Low battery voltage
2. Poor battery connection
3. Damaged harness
Corrective Action
1. Console voltage must be at least 10 V. If low, recharge or replace
battery.
2. Be sure connections are clean and tight. Inspect harness for damage.
3. Check all harnesses for pinches or breaks that may cause power or
8 V-sensor power short to ground.