4 Service mode
4-12 Puritan Bennett 800 Series Ventilator System Service Manual
4.2.10.4 Vent Inop Test
This function exercises the ventilator inoperative circuitry.
4.2.10.4.1 Running the Vent Inop Test
1 Enter Service Mode and select the Other Screens button.
2 Ensure air and oxygen are connected to the ventilator.
3 Connect the gold standard circuit between the To Patient and From Patient ports.
4 Select the Vent Inop Test button and press ACCEPT.
5 The Vent Inop Test is composed of the phases indicated in Table 4-5. At the end of each
test phase, turn the ventilator power off, then on and restart Service Mode as instructed.
Observe the audio and visual alarms and respond as prompted.
If a test phase fails (“Vent Inop Test failed” message in lower screen), powering the ventilator
down and back up into Service Mode will invoke the normal Service Mode. Troubleshoot as
indicated in Table 4-6. You must repeat the Vent Inop Test and pass it with no failures before
ventilation is allowed.
Unable to establish flow Failure Flow controller is not able to establish
a 5 L/min test flow via the expiratory
flow sensor.
1. Verify that there are no leaks or
occlusions.
2. Exit exhalation valve calibration
and perform flow sensor calibra-
tion.
3. Swap air PSOL (PSOL2) and oxy-
gen PSOL (PSOL1). If calibration
passes, replace PSOL2.
4. Swap air flow sensor (Q2) and oxy-
gen flow sensor (Q1). If calibration
passes, replace Q2.
5. Replace expiratory flow sensor
(Q3).
Unable to program flash Failure Unable to program calibration table
into BDU NOVRAM.
1. Check BDU +12 V supply and BD
CPU PCB.
2. Replace power supply.
3. Replace BD CPU PCB.
4. Replace AI PCB.
Table 4-4: Exhalation valve calibration errors (continued)
Message displayed Error type Additional information Corrective action
Table 4-5: Vent Inop Test phases
Test phase Vent inop indicators tested
GUI Vent Inop test 1. BDU alarm on (user prompt).
2. Ventilator inoperative and safety valve open
LEDs on (user prompt).
3. PSOLs/exhalation valve/safety valve inactive.
Vent Inop A test PSOLs/exhalation valve/safety valve inactive.
Vent Inop B test PSOLs/exhalation valve/safety valve inactive.
Vent Inop A ten second test PSOLs/exhalation valve/safety valve inactive.
Vent Inop B ten second test PSOLs/exhalation valve/safety valve inactive.
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