New Holland EHR 4355 – EHR (Electro-Hydraulic Remote) controller: EHR FB 3 High Err

The feedback signal voltage from the position sensor (potentiometer) on the #3 rear remote valve is too high. The system is detecting that the circuit is likely shorted to a high voltage source.

• New Holland 8670
• New Holland T8 series
• New Holland T9 series

1. 1

   Locate the #3 rear remote valve at the back of the tractor.

2. 2

   Visually inspect the wiring harness running to the #3 remote valve for any rubbed, pinched, or exposed wires that could be causing a short to a power source.

3. 3

   Disconnect the sensor/potentiometer on the #3 spool valve and use a multimeter to check the feedback circuit voltage.

4. 4

   Verify if the issue is isolated to the sensor itself or the wiring harness by checking for continuity and proper voltage supply (typically 5V).

1. 1

   Depressurize hydraulic system

   Power down the tractor and ensure the hydraulic system is depressurized.

2. 2

   Identify remote valve

   Access the rear remote valve stack and identify the #3 remote valve.

3. 3

   Trace wiring harness

   Trace the wiring harness from the EHR controller to the #3 remote valve.

4. 4

   Repair or replace wiring harness

   If the wiring harness is damaged, pinched, or shorted to a high voltage source, repair the damaged section of the wire or replace the harness.

5. 5

   Remove faulty sensor

   If the wiring tests good, the fault is likely an internal short within the remote valve's position sensor/potentiometer. Remove the faulty sensor from the spool valve.

6. 6

   Install new sensor

   Install the new position sensor/potentiometer and reconnect the wiring harness.

7. 7

   Test and calibrate

   Power on the tractor, clear the fault codes, and operate the #3 remote valve to verify that the "EHR FB 3 High Err" code does not return and the valve functions correctly. (Note: Some CAN-based EHR valves may require a calibration procedure via the tractor's display after replacing electrical components).