Fendt 0A.1.B8 – A039: A039 - MFA, multifunction armrest

Linear module 2 (rocker switch) is not calibrated. The valve position is not functioning, and the associated hydraulic auxiliary control valve is locked.

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• Fendt 200 V/F/P Vario series
• Fendt 300, 400, 500 Vario series
• Fendt 700, 800 Vario series (COM III, SCR, S4)
• Fendt 900 Vario series (COM III, MT)
• Fendt 1000 Vario series

1. 1

   Ensure that Linear Module 2 (the fingertip rocker switch for the hydraulic auxiliary control valve) is not physically jammed, stuck, or engaged when the ignition is switched on.

2. 2

   Check for related fault code 0A.1.B9. If present and the switch is not physically stuck, the module has failed electrically.

3. 3

   Verify the tractor meets the preliminary conditions for calibration (e.g., engine running, transmission in neutral, hydraulic oil at operating temperature).

1. 1

   Turn the ignition ON and ensure all preliminary conditions for calibration are satisfied.

2. 2

   Access the calibration menu on the tractor's terminal/dashboard.

3. 3

   Enter Calibration Code 1004 (Calibration, linear module 2 / hydr. auxiliary control valve).

4. 4

   Follow the on-screen prompts to calibrate the rocker switch, which typically involves moving the switch through its full range of motion to register the endpoints.

5. 5

   Save the calibration.

6. 6

   If the calibration takes longer than 30 seconds (Error F08), the calibrated values are faulty (Error F02), or the MFA is not responding (Error F03), the calibration has failed.

7. 7

   If calibration fails repeatedly or fault code 0A.1.B9 returns, the linear module 2 (rocker switch) is defective and must be replaced.