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Using remote control "on" the unit, then push the C button of remote control, if the C display at the unit "off" the unit using also the remote control. Unplug the power supply then plug again and start the unit using the remote control. It the instruction above don't solve the problem, the return air sensor is out of range or the main board of the unit itself is defective. You need a qualified tech with this problem.
Start the unit and press the remote control at C if the display in the unit displays C, then turn off the unit using the remote control and plug out the ac supply. Plug the unit again and using the remote control turn on the unit. If the E4 still display there is something wrong with your air in sensor or the main board itself. Replacement of this parts needs a qualified technician.