The installaiton air conditioner is "Automatic timer attached (3 hours operation stopped)", and operation stops automatically after 3 hours have elapsed.
If the operation stops about 3 hours, there is a possibility of a stop by the timer, so it is not a malfunction.
Because this timer function can not change the setting, thank you for your understanding.
Also, in the case of this, the heating operation stops in the winter, there is a possibility that the work "defrosting operation" which warms the outdoor unit of the air conditioner is executed.
※The air conditioner stops operation regularly, such as when the outside temperature is low, and performs the work of warming the outdoor unit. At that time, the condition that the air is blown about 10 minutes from the air conditioner continues in the room, so there are times when you will misunderstand it as a breakdown.
If the operation stops due to symptoms other than the above, the possibility of breakdown is also considered, so please check the maker / model number of the air conditioner and inform us through "inquiry form" or contact the service center I will.