The E1 code is an error code that appears on the LED temperature display of some digital air conditioners. The error code could mean anything from dirty air filters to a damaged room thermistor, a device connected to your thermostat that detects room temperature.
https://www.quora.com/What-is-the-meaning-of-error-code-"e1"-in-the-Voltas-window-AC
Check All the Buttons: The E1 error code sometimes means that one of the control buttons is stuck, particularly on Haier models. Press all the buttons. If you find one that is sticking, free it, and the error code should disappear.
https://www.hunker.com/13407286/how-to-fix-an-air-conditioner-when-it-gives-you-an-e1-code
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