TEMP SENSOR ERROR 4 (Evaporator-In)
Cause
Temperature is abnormal
Solution
Check the sensor if its in range or at least is not “open” or “Shorted”
If the sensor is good replace the main PCB.
If the sensor is not good you will need to replace the entire Duct Assembly.
DETAILS BELOW:
The “Evaporator-in” sensor location.
The “Eva In” sensor is located on the sealed system lines.
With the top of the unit off, you can easily check the status of the “Eva In” sensor from this connector.
Here is another view from the top, some models may have multiple connectors grouped together as you see below. You want to locate the 8 pin connector and test from (Pin1 Green/Red) to (Pin5 Green). It is best to test with the connector disconnected.
The sensor from this test point will read with the harness:
Plugged in = 4k
Unplugged = 10.6k
Above readings are at room temperature approximately 70 degrees. It also may be necessary to remove the wire retainers on the connector to get a good connection.
Notice the resistance reading varies greatly with the connector connected vs. disconnected.
Below is the resistance chart for the Evaporator-In Thermistor with the connector DISCONNECTED:
Note: If any part of the sealed system or sensors or blower located on the Duct Assembly is defective, you must replace the whole Duct Assembly.
