Fendt 10.1.3E – A053: A/C High/Low-Pressure Switch Malfunction

Fault code 10.1.3E indicates a malfunction associated with component S035, the high-pressure/low-pressure switch for the air conditioning system. This safety switch monitors refrigerant pressure and interrupts the circuit to prevent catastrophic A/C compressor damage if the pressure drops too low (e.g., due to a refrigerant leak) or spikes too high (e.g., due to a blockage or condenser fan failure).

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• 300 Vario COM III
• 300 Vario SCR
• 400 Vario COM III
• 500 Vario SCR
• 700 Vario COM III
• 700 Vario SCR
• 800 Vario COM III
• 800 Vario SCR
• 900 Vario COM III
• 900 Vario SCR

1. 1

   Locate the S035 switch at the front of the tractor near the cooler package, mounted on the A/C fluid reservoir (receiver drier).

2. 2

   Inspect wiring and connector X341 for corroded pins, loose connections, or broken wires that could cause a false reading.

3. 3

   Check system pressures using an A/C manifold gauge set. If static pressure is extremely low or zero, check for a refrigerant leak. If the system is fully charged but the switch reads open (no continuity), the switch has failed internally.

1. 1

   Recover refrigerant

   If the S035 switch does not have a Schrader valve underneath it, recover the R134a refrigerant using an approved A/C recovery machine.

2. 2

   Disconnect electricals

   Unplug the wiring harness at connector X341.

3. 3

   Remove the switch

   Unscrew the faulty S035 high/low-pressure switch from the receiver drier. It is highly recommended to replace the entire receiver drier assembly whenever the A/C system is opened.

4. 4

   Install the new part

   Thread the new switch (or new receiver drier with switch) into place. Ensure any required O-rings are lubricated with clean PAG oil before installation.

5. 5

   Evacuate and recharge

   Pull a deep vacuum on the A/C system to remove ambient moisture and air. Recharge the system with the exact OEM-specified weight of R134a refrigerant and PAG oil.

6. 6

   Clear codes and test

   Use the tractor's terminal or the FENDIAS diagnostic software to clear the 10.1.3E fault code from the ECU memory. Test the A/C system for proper operation.