In alarming state, the alarm sound could be suspended by pressing any button, but the alarm display remains until the alarm condition is eliminated. Besides, if there is no error code and the red light on, that maybe water flow alarm. Troubleshooting as below: When the red light on and the controller display water temp in normal, you can connect the water inlet with outlet by a hose, if the alarm is eliminated, that means the internal water circulating loop work in normal and the outside pipe blocked; If the chiller continue to alarm, that means internal water loop blocked. When the red light on, the temperature no display or show 8.88, firstly we should cutt off the power line of water pump and check if the temperature controller display water temp in normal, we can judge the water pump failure, pls change it; Howerever if the temperature controller can`t display water temp or show 8.88, we can judge the power of water pump failure, and we should change another one. Feel free to contact us. More about S&A chiller: http://?