A:Answer Regrettably, without a description of when the red light that you are inquiring about appears on the LG LG Black Stainless Steel Series 2.0 cu. ft. Countertop Microwave Oven with EasyClean®, Model # LCRT2010BD, we cannot determine what it indicates. Please contact our Support Center at (800) 243-0000 and be prepared to give them as much detail as you can with regards to the red light so they are able to better assist you...^IFV