Confirm the room temperature, does the temperature set too low?
If it is please set the temperature to suitable higher temperature. • Defrosting (Owner Manual Page 8) When the outdoor air temperature is very low and humility is very high, frosting will occur to the exchanger of the outdoor unit, which has negative impacts upon the efficiency of the heating performance. In such case, the automatic defrosting function will come into function. The heating operation will be stopped short period of time 5~10 minutes to defrost the outdoor unit. a. The fans of both the outdoor and indoor units are stopped. During the defrosting operation, the run light will indicate flashing slowly. b. During the defrosting, the outdoor unit might generate some steam. It is caused by fast defrosting, which is not a performance failure. c. Upon the completion of the defrosting process, the operation is resumed. • The rest please conducting to the owner manual page 11.