Fendt 9.3.24 – EPC C: Front power lift 'lift height limit' rotary control — Signal fault

The control module is receiving an erratic, missing, or out-of-range electrical signal from the potentiometer responsible for setting the upper stop position (maximum lift height) of the front power lift, triggering a 'Control locked' state.

• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 715 Vario
• 716 Vario
• 717 Vario
• 718 Vario
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• Fendt 300 Vario series
• Fendt 400 Vario series
• Fendt 700 Vario series
• Fendt 800 Vario series
• Fendt 900 Vario series

1. 1

   Verify the fault state by confirming the front EPC is locked out and checking active fault codes on the multi-display.

2. 2

   Inspect the rotary control (P1 or P3) on the armrest console for physical damage, sticking, or a broken internal stop.

3. 3

   Check the wiring harness and connector under the control console for loose connections, backed-out pins, or chafed wires.

4. 4

   Test the sensor supply voltage to ensure the potentiometer is receiving the correct reference voltage (typically 8.5V or 9.5V) and has a good ground.

5. 5

   Perform a sweep test on the potentiometer using a multimeter or FENDIAS software to ensure the signal voltage scales smoothly without dropouts.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to prevent electrical shorts.

2. 2

   Access the Console

   Disassemble the right-hand control armrest/console to gain access to the underside of the rotary control panel.

3. 3

   Remove the Faulty Component

   Disconnect the electrical harness connector from the front power lift height limit potentiometer. Remove the retaining nut or locking tabs holding the rotary control in place and extract the faulty unit.

4. 4

   Install the New Part

   Insert the replacement genuine Fendt rotary control potentiometer, secure it, and plug in the electrical connector.

5. 5

   Reassemble

   Reinstall the armrest/console covers.

6. 6

   Reconnect Power

   Reconnect the tractor's battery.

7. 7

   Clear Fault Codes

   Clear the stored fault codes from the tractor's memory. On many Vario models, this can be done by simultaneously pressing keys D, B, and C on the multi-display.

8. 8

   Test Operation

   Turn the tractor on and test the front power lift. Verify that the "Control locked" state is cleared and that the lift height limit adjusts correctly when the rotary control is turned.