CASE 1958217 - Caterpillar

Illustration 1 g01026613
(1) Display of set temperature (2) Temperature selection switch (increase) (3) Recirculation switch (4) "DEF" switch (5) Temperature selection switch (decrease) (6) Power switchNote: Understand the starting procedure before you begin.
Turn the engine start switch ON.
Turn power switch (6) of the air conditioner OFF.
Depress the temperature selection switch (increase) (2) and the temperature selection switch (decrease) (5) on the control panel at the same time. Hold both switches down for at least three seconds.
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.
When the temperature selection switch (increase) (2) is depressed, error codes are displayed. The error codes are displayed in ascending order from "E11" to "E51". When the temperature selection 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.
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.
Clear the error codes. 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.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.Ending the Fault Diagnosis
There are two ways to end the fault diagnosis.
Turn the engine start switch OFF.
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    
"E17"     Sunlight sensor     Open circuit    
"E18"     Sunlight sensor     Short circuit    
"E21"     Sensor at evaporator     Open circuit    
"E22"     Sensor at evaporator     Short circuit    
"E43"     Air damper for discharge of air     Incorrect movement    
"E44"     Air damper for mixed air     Incorrect movement    
"E45"     Air damper for recirculated air versus fresh air     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