New Holland NH 4104 – Armrest Control Module (ARU) or ATC (Alta Implement) / Hydraulic Controller: Remote No.1 Under voltage

This code indicates that the voltage supplied to, or the signal returning from, the electronic spool valve for Rear Remote No. 1 is below the minimum expected threshold. This typically points to a wiring issue, a failing solenoid/potentiometer on the valve, or a supply issue from the control module.

• New Holland T7 Series (T7.170, T7.190, T7.220, T7.260)
• New Holland T8 Series
• New Holland T6000 Series (T6010–T6080)
• New Holland T7000 Series

1. 1

   Inspect the wiring harness leading to the Rear Remote No. 1 valve assembly at the back of the tractor for chafed wires, pinched harnesses, or disconnected plugs.

2. 2

   Disconnect the electrical plug at the Remote No. 1 valve and check for water ingress, bent pins, or corrosion, which commonly cause voltage drops.

3. 3

   Using a multimeter, verify the supply voltage at the valve connector while the key is ON and the remote is commanded via the armrest. Compare the reading to the adjacent Remote No. 2 valve.

4. 4

   Swap the electrical connector from Remote No. 1 to Remote No. 2 (if harness allows). If the fault code changes to NH 4118, the issue is the valve's solenoid/potentiometer. If NH 4104 persists, the issue is in the wiring harness or the Armrest Control Module.

1. 1

   Preparation

   Park the tractor on a level surface, lower all implements, turn off the engine, and cycle the hydraulic levers/buttons to relieve any residual hydraulic pressure.

2. 2

   Clean the Area

   Thoroughly clean the rear remote valve stack to prevent dirt from entering the hydraulic system during disassembly.

3. 3

   Harness Repair (If Applicable)

   If the diagnostic checks revealed a wiring fault, splice and repair the damaged section of the harness using weather-sealed connectors, or replace the affected harness section.

4. 4

   Valve/Solenoid Replacement (If Applicable)

   Disconnect the electrical connector to the Remote No. 1 slice. Remove the retaining bolts holding the Remote No. 1 valve section to the hydraulic manifold block. Carefully slide the valve section out, ensuring you do not lose or damage the O-rings between the valve slices. Install the new valve section (or replacement solenoid/potentiometer cap) with new O-rings. Torque the manifold tie-bolts to the OEM specification.

5. 5

   Reassembly and Testing

   Reconnect the electrical harness. Start the tractor, navigate to the IntelliView display, and clear the inactive fault codes. Test the Remote No. 1 paddle on the armrest to ensure proper spool movement and verify that NH 4104 does not return.