Google says:
E6 Room temperature or evaporator temperature sensor open or short circuit
The prescribed cure:
Check to make sure the room temperature sensor is connected and reads the correct resistance value. If the sensor operates correctly, replace the control board.
This unit most likely employs a NTC thermistor as a thermometer sensor. Common resistance values are 1k ohms and 10k ohms at room temperature. As the temperature goes up, the sensor decreases in resistance.
The sensing element could look like any of the above, but with portable comfort units, they usually look like the bottom row of encapsulated and cabled assemblies.
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