I bought this a couple of years ago, and more than 1/2 of the time I use it, I get error codes. The most common are error code 4 and 2. Error code 4 indicates a leak, but even after adjusting it and checking for leaks I sometimes get the same code, and sometimes I don't do anything differently and the code isn't repeated. Error code 2 is the most frustrating. It indicates that the device can't find a pulse, but only after ramping all the way up as if it's working properly. It doesn't matter if ISee full review