Self-tests
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
3-21
3.5 Ongoing checks
Ongoing runtime checks are continually performed during ventilation. If an unexpected
condition is detected, a code is logged into the alert log. In addition, the ventilator responds
in one of the following ways depending on the type of condition detected. To troubleshoot
the ventilator, review the alert log (Section 4.2.4). The diagnostic codes stored in the log are
further described in Chapter 6.
•
Technical alert
– The ventilator has detected an undesirable condition arising from a
current or pending malfunction of the ventilator or its supply gas. Examples are battery
not charging or ventilator internal temperature too high. The code is logged into the
alert log. Ventilation continues, although the ventilator displays a message describing the
condition; see Chapter 7 for a listing of these messages. The audible alarm is sounded and
the ALARM or CAUTION light is lit. Some technical alerts are automatically reset if the
triggering condition disappears.
•
Software error or hardware error not expected to compromise ventilation
– The
ventilator has detected an error while running an ongoing check. The ventilator is reset.
The code is logged into the alert log. If more than three such errors are detected within
24 hours, a VENT INOP condition is declared, which results in the ventilator being placed
in the SVO state. To clear the VENT INOP condition, you must repair the ventilator and run
and pass EST before ventilation can resume. To do so, first cycle power to the ventilator.
The ventilator will now let you access a limited set of service menu functions only (see
Chapter 4). Use the
EST
function to run the extended self-test. The results of the EST run,
the contents of the test and/or alert log, and other service menu functions will help you
determine what to repair. If the error recurs or if multiple errors occur, the problem
requires corrective action. Contact your regional Covidien Technical Support.
•
Hardware error that might compromise ventilation
– A VENT INOP condition is declared,
which results in the ventilator being placed in the SVO state. The code is logged into the
alert log. To clear the VENT INOP condition, you must repair the ventilator and run and
pass EST before ventilation can resume, as described above.
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