The customer reported pressure occlusion and a stalled blower.
There was patient involvement, but no one was harmed.
The manufacturer¿s field service engineer (fse) confirmed the reported issue.
The fse checked the patient circuit, performed performance testing and checked the blower and software.
The fse determined that the blower could not produce sufficient pressure or the blower speed signal had failed.
The fse verified that the blower was connected to the mc pcba (motor controller printed circuit board assembly), verified that the blower rpm (revolutions per minute) monitor increased above 3000 rpm when the pressure controller was set to a value above 0 (cmh20) centimeters of water.
The fse advised if the blower rpm did not increase above 3000 rpm to replace one of the following to re-establish the tachometer signal.
The fse advised may be the blower, mc pcba, and/or (central processing unit).
In reference to the patient circuit occlusion error, the fse checked the patient circuit for bulk liquid, crimps, or blocked filter.
The fse confirmed the ventilator and alarm settings were appropriate.
The fse advised if the problem persisted to provide alternative ventilation and to service the ventilator.
The fse replaced the blower assembly and provided proper operation check.
After corrective maintenance, the equipment is operational and complies with the manufacturer's specifications.
The necessary checks have been carried out to certify the return to the pre-failure operating conditions.
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