Massey Ferguson 10.00.10 – AIRCON: Air Conditioning Evaporator Temperature Sensor Short Circuit

The controller has detected a short circuit in the wiring or internal components of the temperature sensor located at the AC evaporator. This causes the sensor to send an impossible temperature value to the system. As a failsafe to prevent the evaporator core from freezing over, the system turns off the air conditioning compressor, preventing cooling.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• Tier 4 models (2012–2023)
• 4700 Series (4707, 4708, 4709, 4710)
• 5600 Series (5608, 5609, 5610, 5611, 5612, 5613)
• 5700SL Series
• 7600 Series (7614 through 7626)
• 7700 / 7700S Series
• 8600 Series

1. 1

   Verify the symptom by confirming that the AC compressor clutch is not engaging and the cab is not cooling.

2. 2

   Locate the evaporator temperature sensor (X443) and visually inspect the wiring harness between the sensor and the AIRCON module for pinched wires, chafing, or melted insulation.

3. 3

   Disconnect the sensor and use a multimeter to check its resistance. A reading near zero ohms indicates a dead short and requires sensor replacement.

4. 4

   If the sensor reads normal resistance, test the machine's wiring harness for a short circuit to ground or voltage.

1. 1

   Park the tractor on a level surface, turn off the engine, and disconnect the battery to prevent electrical damage.

   Park the tractor on a level surface, turn off the engine, and disconnect the battery to prevent electrical damage.

2. 2

   Gain access to the HVAC unit (typically located in the cab roof or under the cab floor, depending on the specific tractor series). Remove the necessary access panels/covers.

   Gain access to the HVAC unit (typically located in the cab roof or under the cab floor, depending on the specific tractor series). Remove the necessary access panels/covers.

3. 3

   Locate the evaporator temperature sensor, which is usually inserted directly into the fins of the evaporator core or mounted on the evaporator housing.

   Locate the evaporator temperature sensor, which is usually inserted directly into the fins of the evaporator core or mounted on the evaporator housing.

4. 4

   Disconnect the electrical connector from the sensor.

   Disconnect the electrical connector from the sensor.

5. 5

   Carefully pull the faulty sensor out of the evaporator core.

   Carefully pull the faulty sensor out of the evaporator core.

6. 6

   Insert the replacement sensor into the exact same location and depth to ensure accurate temperature readings.

   Insert the replacement sensor into the exact same location and depth to ensure accurate temperature readings.

7. 7

   Reconnect the electrical connector.

   Reconnect the electrical connector.

8. 8

   Reinstall all HVAC covers and cab panels.

   Reinstall all HVAC covers and cab panels.

9. 9

   Reconnect the battery and turn the key on. Clear the inactive 10.00.10 fault code from the AIRCON module.

   Reconnect the battery and turn the key on. Clear the inactive 10.00.10 fault code from the AIRCON module.

10. 10

    Start the tractor and test the AC system to ensure the compressor engages and the system cools properly without freezing.

    Start the tractor and test the AC system to ensure the compressor engages and the system cools properly without freezing.