Dayun fan's quick shutdown timeout means that during the quick shutdown process, the fan's downtime exceeds the set time limit, resulting in system alarm or failure. When running, the fan needs to be stopped or braked, and the quick stop function can be selected. This function can quickly reduce the fan speed and stop running, so as to avoid fan damage or safety problems caused by failure or other reasons. However, in order to ensure the normal operation and safety of the fan, the system usually sets the time limit for fast shutdown. If the quick stop time exceeds the limit, there will be an error prompt that the quick stop time of Dayun Fan exceeds the limit. At this time, it is necessary to check the control system and equipment of the fan, find out the cause of the failure and repair it in time.