307D, 311D, 312D, 313D, 315D, 318D, 319D, 320D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 340D, 345D, 349D, 374D, 390D and M325D Excavators Air Conditioning and Heating Troubleshooting Faults With Service Codes Caterpillar


Troubleshooting Faults With Service Codes
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1.1. Starting the Fault Diagnosis
2.1. Ending the Fault Diagnosis
3.1. Error Codes
4.2. Inspecting a Wiring Harness

Starting the Fault Diagnosis




Illustration 1g03657805

Control Panel Type 1




Illustration 2g03343161

Control Panel Type 2

(1) Display of set temperature

(2) Temperature select switch (increase)

(3) Recirculation switch

(4) "DEF" switch

(5) Temperature select switch (decrease)

(6) Power switch

(7) Fan speed switch (decrease)

Note: Understand the starting procedure before you begin.

  1. Turn the engine start switch ON.

  1. Turn power switch (6) of the air conditioner OFF.

  1. Depress the temperature select switch (increase) (2) and the temperature select switch (decrease) (5) on the control panel at the same time. Hold both switches down for at least three seconds.

  1. The diagnosis procedure shall start. If any error is memorized, the smallest error code is displayed on display (1). If no problems exist, "E-.-" is displayed.

  1. When the temperature select switch (increase) (2) is depressed, error codes are displayed. The error codes are displayed in ascending order from "E11" to "E51". When the temperature select switch (decrease) (5) is depressed, error codes are displayed. The error codes are displayed in descending order from "E51" to "E11".

    Note: When only one error code exists, the same display is repeated. A flashing display means that the error code is continuing from the past. A non-flashing display means that the error code was found in the past, but the error code is not found now.

  1. When the fault diagnosis is running, the control of each function is altered.

    • All outputs from the control panel except error codes are turned OFF.

    • The panel light turns ON.

  1. Clear the error codes.

    Note: Clear any error codes when the equivalent problems have been repaired. Make sure that the same error code is not displayed again. When a problem has not yet been repaired, the equivalent error code should be displayed again.

    1. For Control Panel Type 1 depress the following two switches on the control panel at the same time: recirculation switch (3) and "DEF" switch (4). Hold both switches down for at least three seconds.

    1. For Control Panel Type 2 depress the following two switches on the control panel at the same time: recirculation switch (3) and Fan speed switch (decrease) (7). Hold both switches down for at least three seconds.

Ending the Fault Diagnosis

There are two ways to end the fault diagnosis.

  1. Turn the engine start switch OFF.

  1. Press power switch (6) .

Error Codes

Table 1
Error Codes for the Automatic Temperature Control (ATC)    
Code     Problem Area     Problem    
"E11"     Sensor for recirculated air     Open circuit    
"E12"     Sensor for recirculated air     Short circuit    
"E13"     Sensor for fresh air     Open circuit    
"E14"     Sensor for fresh air     Short circuit    
"E15"     Water temperature sensor     Open circuit    
"E16"     Water temperature sensor     Short circuit    
"E21"     Sensor at evaporator     Open circuit    
"E22"     Sensor at evaporator     Short circuit    
"E43"     Damper for air outlet     Incorrect movement    
"E44"     Damper for air inlet     Incorrect movement    
"E51"     Refrigerant pressure     High/low error    

Inspecting a Wiring Harness

Electrical problems are often caused by faulty electrical wires that have either an open circuit or a short circuit. The following procedures explain the test for an open circuit or a short circuit:

ReferenceRefer to Schematic, "Air Conditioning Electrical System" for the correct electrical schematic.

Test for an open circuit.

  1. Turn the battery disconnect switch key and the key start switch to the OFF position.

    Note: A separate electrical wire must be used to perform an open circuit test. Any harness wire can be used.

  1. Install a jumper (connecting wire) between the two electrical wires at one end of the harness.

  1. Use a multimeter in order to check for continuity across the two electrical wires at the other end of the harness.

  1. Turn the multimeter dial to the 200 ohm range and measure the electrical resistance.

Note: If there is continuity between the electrical wires, the multimeter will have a reading of less than 5 ohms. If there is not continuity, the electrical wire is faulty. The electrical wire should be replaced with another wire of the same gauge.

Test for a short circuit.

  1. Turn the battery disconnect switch key and the key start switch to the OFF position.

  1. Disconnect the electrical wire.

  1. Turn the multimeter dial to the 200 ohm range and measure the electrical resistance.

  1. Use one multimeter probe in order to make contact with the connector of the faulty electrical wire.

  1. Use the other probe from the multimeter to check for continuity across all other electrical wires in the same harness.

  1. If there is continuity between any of the electrical wires, the multimeter will have a reading of less than 5 ohms.

Note: If there is not continuity, the electrical wire is faulty. The electrical wire should be replaced with another wire of the same gauge.

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