When the Window Unit Status light (the one on top) is Flashing Red it means that the Window Unit has temporarily stopped working and has switched to a low power mode because the environment is too warm. You may also note an error code number 4 on the seven-segment display of the coverage unit.
Step 1: Check if the vents are blocked or covered on the Window Unit
Step 2: Move the Window Unit to a cooler spot
Step 3: Please wait and the Window Unit will start operating again when it cools down
Step 4: Reset the Coverage Unit by unplugging the power, waiting a few seconds and then plugging it back in.
If you have places the unit in a cool area and waited for more than an hour and it has not stopped flashing, please visit:http://cel-fi.com/warranty/exchange