Error on monitor

Replace the water trap. If that doesn't work you can probably fix it by just performing a PM. This is a GE device, not Philips. 

Please be advised that because the fix to this is so basic, yet these questions had to be asked - make sure you are qualified to work on, and verify the operation of medical equipment to the manufacturer's standards. This is not something I would expect an entry level technician with any amount of training to have to ask. Where does the water come from in a device with a water trap??? Hmmm...