About a year ago this CPAP shut down during the night with the error code E-77 that alerted me to a pressure sensor problem. Reading a bit about the nature of this problem with this unit, I easily disassembled it and located the hose barb nearest the air outlet had split and I removed it with plenty of the connector stub left to reconnect the hose. Problem solved until about a month ago when in the middle of the night the air flow shut off again and the alarm sounded showing the same code. I opened it up thinking the hose might've slipped off the connector but that wasn't the case. I put it back together and it ran fine for about an hour and then shut down again. I had to unplug the power each time this happened & etc. making my nights frustrating after this happened with increasing frequency. Now it shuts down in about five minutes. I'm pretty much convinced that an actual pressure sensor is the problem with the unit at this point. I'm in the process of getting a new device but it seems a shame to trash and otherwise great piece of equipment.
Does anyone have available or access to a schematic for my unit showing the parts? I'm assuming that since the circuit board contains practically everything for this unit outside of the fan motor, I'm also assuming parts such as the two pressure sensors it uses are common to other models from Respironics of the same model type and time period. I'd love to be able to find the parts from a scrapped unit to replace them on mine so that I might have a backup machine. It's taken me over two weeks to get to the point of getting a replacement unit. Sleeping in a recliner is for the birds! If anyone can help with either info or parts, I'm heartily thanking you in advance!