5 days ago · MRCOOL provides these articles and instructions as general guidance for the use and maintenance of our products. However, MRCOOL is not responsible for any injuries or . Error Display (Indoor Unit) When the indoor unit encounters a recognized error on different models, 1. the running LED with flash in a corresponding series, the timer LED may turn on . For technical assistance, please contact MRCOOL technical support at () 6. When the product is malfunctioning and/or is inoperable, p