Patient repositioned.The ventilator was alarming low pressure.Attempts made to adjust control to correct alarm condition.Visually inspected the circuit/vent for disconnection, there was none.The ventilator would not pressurize.Patient was removed and new ventilator put in place.No patient harm.Manufacturer response for ventilator, 3100a oscillator (per site reporter): our tech performed circuit calibration and ventilation performance check.Both were slightly substandard.Circuit replaced.Vent then met manufacturers specs.Manufacturers' service technician was to be onsite approximately a week ago to inspect the device.
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