Jianghang oxygen concentrator JH-I-3L how to turn off the timer function, press the wrong old timer, and now the top display is L89, 89 is the time L what is it?

Hello, this oxygen concentrator is a remote control, cancel the timer on the line, if the remote control is not in, the machine display next to a "+" number a - number. Hold down the "-" sign has been pressed to the display for "---" so, is 24 hours of continuous operation. If the red light on the top of the alarm is on, it means that your oxygen concentrator is running faulty, not necessarily the concentration, you have to call the after-sales service, I hope to help you, good. Nurse... Medical equipment... I'm happy to help. I'm glad to give you an answer.