Press the "Power" button to turn off your unit and then remove the filter from the filter panel on the side or front of your air conditioner. Refer to your manual if you are unsure where the filter on your unit is located.
2 Inspect the filter. If it is dirty, brush off dirt, debris and lint. If it is really dirty, wash it with mild soap and water and allow it to dry completely. Reinsert it into its compartment. If your filter is worn out or damaged, purchase a replacement filter from an appliance or hardware store and replace the old one.Turn on the air conditioner. Move to the next step if the LCD continues to display the E1 error code.
3 Check for a reset button on your air conditioner and press it to reset your unit. Some of the newer air conditioners have reset buttons to restore the default factory settings. Press the "Power" button on the front panel of your air conditioner to power down your unit if it does not have a reset button. Unplug the unit from the electrical outlet. Leave the air conditioner off for several hours to see if it will reset.
4 Plug your air conditioner back into the electrical outlet and turn it on. If your air conditioner is still displaying the E1 error code, turn it off and contact a qualified technician because the room thermistor responsible for detecting room temperature may be defective.
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