Troubleshooting
Puritan Bennett 540™ Ventilator User’s Manual
3-19
HIGH RATE
Adjustment of the High Rtot level too low.
Under the guidance of a Clinician re-
adjust High Rtot.
Adjustment of the Insp Sens level too low.
Under the guidance of a Clinician adjust
Insp Sens according to the patient.
Patient’s hyperventilation.
Silence the alarm and call for a medical
team if the symptoms persist.
Defective inspiratory flow sensor.
Have a qualified technician replace the
defective component(s) and call your
customer service representative.
INVERSED
I:E RATIO
Adjusted Insp Time inducing an inspiratory
time higher than the expiratory time.
Decrease the adjustment threshold of
Insp Time.
WARNING
Ensure the Insp Time setting is
compatible with the physiological
requirements of the patient.
KEYPAD FAULT
CALL SERVICE
*IF PERSISTS REPLACE
VENT
Pressing a key for more than 45 seconds.
Press and release keys in the normal,
prescribed manner. Do not press keys for
45 seconds or more.
A key on the keyboard is stuck.
Attempt to activate each key. If
unsuccessful in releasing the stuck key(s),
replace the device and call your customer
service representative if the situation
persists.
LOW BATTERY
Internal battery capacity is less than
30 min. (or 5%)—battery operation over
extended.
Immediately connect the ventilator to an
AC power outlet, or connect it to an
external DC power source.
Reminder: the internal battery can be
charged only when the ventilator is
connected to an AC power supply.
LOW EXH VOLUME
Patient circuit obstructed.
Clean, unblock, and/or properly connect
the patient circuit.
Leak in the patient circuit.
Check and properly connect the patient
circuit connections.
Exhalation block missing or disconnected.
Call your customer service representative
or clinician.
Adjustment of a Low VTE threshold when
the patient circuit is in a single-limb
configuration.
Set the Low VTE alarm limit to OFF.
WARNING
If exhaled volume monitoring is
required, use the double-limb circuit
for exhaled tidal volume or minute
volume monitoring.
Inappropriate patient circuit.
Replace the patient circuit with an
appropriate one.
Expiratory flow sensor not properly
calibrated.
Call your customer service representative
or clinician.
Defective expiratory flow sensor.
Replace the defective component(s) and
Call your customer service representative
or clinician.
Adjustment of the Low VTE level too high.
Under the guidance of a Clinician modify
the Low VTE level.
Table 3-2.
Alarms and Corrective Actions (Continued)
Alarm Message or
Symptom
Possible Reason(s) For The Alarm Event
Corrective Action(s)
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