Ventilator Failure Alarm Troubleshooting Guide - Datex-Ohmeda Anesthesia Delivery Unit S/5 Technical Reference Manual

Datex-Ohmeda ADU
Message
in
Normal
Screen
Ventilator
*
failure
Ventilator
*
failure
Ventilator
*
failure
Ventilator
*
failure
Ventilator
*
failure
Ventilator
*
failure
Ventilator
*
failure
*) Check also Ventilator failure alarm troubleshooting guide for reason for ventilator failure alarm.
Beware of the O
consequent of a ventilator failure alarm.

Ventilator failure alarm troubleshooting guide

The suggested actions below should be seen as a starting point when a intermittent Ventilator failure
alarm has occurred, this means that an sensor error for example can be due to a broken CPU board or
DC/DC board.
The reason for a ventilator failure (Safe State) is stored in the Ventilator EEPROM. In position 15 an ID
is stored and in position 16 to 19 some extra information is stored. All values are stored in
hexadecimal format.
Beware of as long the Ventilator failure alarm is present, can not the correct data be presented from
the EEPROM on the A-EV1 Diagnostic page. This because the communication between A-ELEC and A-
EV1 not are working correctly (this is also the reason to that the O
communication error alarm comes as sub alarms to the Ventilator failure alarm).
To check the EEPROM values on a failing ADU with a Ventilator failure alarm must the ADU be
restarted and no Ventilator failure alarm be present.
If the alarm is present should the fault be traced by entering the A-EV1 diagnostic page and
performing the trouble shooting from the messages found under STATUS in the diagnostic page.
C-54
Message in Error condition /
diagnostic possible cause
page
HW watchdog err HW watchdog circuit
does not reset system
during internal system
check
ROM check sum Program memory is faulty
RAM W/R error Faulty components on
CPU board
Hw reset Unexpected reset of CPU
Flow zero-error Failed test of flow zeroing
valve
Backup CPU Error Failed test of backup CPU
pilot press err During the A-EV1 Self-
test was the pilot
pressure below
120cmH
supply lost alarm and the ventilator communication alarm will go off as a
2
Recommended
action
Replace CPU board
Replace program
or
replace CPU board
Replace CPU board
Replace CPU board
Replace flow sensor or
zeroing valve
Replace CPU board
Calibrate pilot pressure
regulator.
Check pipeline gas
O. supply pressure.
2
Replace pilot pressure
regulator
supply lost alarm and Ventilator
2
Err
log
x
x
x
x
Document No. 8502855