Friend good night I leave some possible options that you would have to test in order to verify it. I have no manual, but it is likely that a low outflow was noticed. This is caused by clogged filter in the output line. There is a horizontal tube, on one side (I don't remember its name whichone) there is a bronze filter, take it out, clean it careffully and reinstall. You must solve the problem. Check the main valve that has a membrane leak Sometimes you can read Err. 21 means contamination, upgrade ic 93Lc56b from processor board. Is this a numerical display with pressure and gas flow display Many times there may also be a sensor failure, I have even seen equipment connected to the tube directly TIME TO THINK PLEASE ONLY TECHNIQUES SPECIALLY PREPARED IN ELECTROMEDICINE REPAIR THE FAILURE I LIKE TO DISARM AND SEE WHAT IS THE PROBLEM MY OPINION IS NEVER SUFFICIENT FOR ANOTHER COMPANION THAT IS LIKE ME AMATEUR