Can you provide the model number for your vacuum for review? With limited information and research, I have found in order to clear a red filter light after cleaning, you will need to ensure the washed parts are completely dry (at least 24 hours) and properly reinstalled, as the "missing filter" or, "clogged" sensor triggers the light. If the light persists as you've stated then we recommend for you to ensure all the parts are properly reinstalled, check for blockages, and power cycle the unit for approx. 2 mins and give it retry.
