Self-tests
3-20
10070389 Rev. A
Puritan Bennett™ 700 Series Ventilator System Service Manual
17
Fan test
Checks air flow thermistor
reading to determine whether
fan is operational.
1. Make sure room temperature is not too
low. Make sure that ventilator has warmed
up and attained a steady-state
temperature.
2. Verify main fan rotates.
3. Verify main fan/ventilator head harness
connection is secure.
4. Verify main fan filter is present and clean.
Clean or replace as required.
5. Verify air flow thermistor assembly/
ventilator head harness connection is
secure.
6. Verify voltage to fan is b23 and
+25 V. If voltage is present and within
range, replace fan. It it is not present or is
out of range, replace pressure solenoid
PCB.
18
Heaters test
Checks thermistor assembly
readings to determine whether
heaters are operational.
1. Verify control thermistor (top) is correctly
installed.
2. Verify heater and thermistor assemblies
are securely connected to main ventilator
head harness.
3. Replace exhalation heater assembly.
4. Replace exhalation thermistor assembly.
5. Replace pressure solenoid PCB.
Table 3-9: EST troubleshooting (continued)
EST
test no.
Test name
How the ventilator performs the
test
Corrective action
Summary of Contents for Puritan Bennett 700 Series
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