5 Troubleshooting
1006-0453-000 05/04
5-13
Flow Valve
Failure
(DAC)
or
(Current)
Minimum
Monitoring
(8) (9)
Incorrect feedback
Perform the flow valve test.
Check the flow current sense from the service
mode Display A/D channels. Should be near
zero counts. If not, replace the CPU board.
Check the cable to the flow valve from the CPU
board.
Check the flow valve resistance
(approximately 1.75
±
0.1 ohm). This must be
tested at the flow valve, not through the cable
from the CPU board. If not correct, replace the
flow valve.
Replace the CPU board.
Gas Inlet
Valve Failure
(7)
Minimum
Shutdown
(6)
Bootup test failure
Check the GIV current sense from service
mode under Display A/D channels (2371 to
3884 counts).
If out of range, check the CPU to gas inlet valve
cabling. Then measure the gas inlet valve
resistance to be 25
±
2 ohms. If not, replace
the gas inlet valve solenoid.
Go to "Display I/O signals" screen. DPL
switch status must be Off. If On is indicated,
remove the bellows assembly. If On continues
to be displayed, replace the SIB.
Perform Cal bleed resistor from service mode
to ensure there is no problem with the bleed
resistor.
Replace the SIB.
Replace the CPU board.
Gas Inlet
Valve Failure
Minimum
Monitoring
Incorrect feedback
Perform the gas inlet valve test.
Check the cable to the gas inlet valve from the
CPU board.
Check the gas inlet valve resistance
(25 ± 2 ohms).
Replace the CPU board.
Hardware
Watchdog
Failure (7)
Minimum
Shutdown
(6)
Ventilator malfunction.
Ventilate manually.
Monitoring is not
reliable.
Replace the CPU board.
Heliox?
or
Heliox Mode
is On
low
Control setting on
ventilation setup menu.
When Heliox is used, the ventilator must adjust
volume calculations.
Check Heliox setting on the ventilator setup
menu.
Message
Alarm type/
Priority
Enabling Criteria
Alarm Condition
Service Repair
Removal Criteria
Summary of Contents for Aestiva 7900 SmartVent
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