Maintenance and Calibration
46
3.4.2 Alarm messages during the compliance test, leak test and O2 calibration
Display message Cause Corrective action User
Corrective action
Service technician
System Resistance
too high
AVM 3-2
If with in 1 sec. after a flow of
12 l/min has been generated, a
pressure increase of 10 mbar is
measured
Repeat the compliance test Check the breathing circuit for
obstructions
Leak rate too high
AVM 3-2
If after 10 mbar have been
reached, 40 mbar are not
reached within 2s
Troubleshoot the breathing
circuit for leakages
Troubleshoot the breathing
circuit for leakages
Compliance out of range
AVM 3-2
The measured compliance has
to be between 2.0 and 9.9
Replace bacteria filter and
breathing circuit. Use the
Compliance test in Standby /
OPTIONS to retest. If all else
fails call Service.
Replace bacteria filter and
breathing circuit. Check the
complete breathing system for
obstructions.
System Error
Cal Required
Call Service
AVM 3-2
Data for parameter or alarm
limit settings was not saved
correctly, the data exchange
between the ventilator modules
and on-screen display is faulty
or the startup test for Internal
circuit EEPROM has failed.
Retry function. Reboot
machine. If all else fails call
Service.
Recalibrate the system. If this
fails, exchange the module 2
processor board
Check Diaphragm Valves
AVM 3-2
The PV closes after 40mbar
has been reached. If after this a
pressure increase of 4 mbar
takes place within 4 s
Remove the Breathing circuit
from the Docking Station and
check the Decoupling and
Expiratory valves for intact
membranes. Replace as
required or call Service.
Remove the Breathing circuit
from the Docking Station and
check the Decoupling and
Expiratory valves for intact
membranes. Replace as
required
Pressure Reading out of
tolerance
Perform Compliance Test
when convenient
If the pressure sensors
measure a difference greater
than 3 mbar during the offset
comparison, even though the
system is pressure relieved.
Take the machine out of use;
Call Service
Recalibrate the pressure
sensors and check the
according tubing. If that does
not solve the problem exchange
the module 2
Flow Error:
Use Manual Ventilation
Call Service
Compliance Test
• When during the
offset calibration a flow of
greater than 3 L/min is
detected
• During the
compliance test a flow of
12 L/min is delivered
through the prop. valve. If
the delivered flow is out
of tolerance
Flow Sensor Error
Take the machine out of use;
Call Service
Recalibrate the proportional
valve, internal flow sensor and
the characteristic of the
proportional valve. If that does
not solve the problem,
exchange the
1. proportional valve
2. internal flow sensor
Flow/Volume Readings
not available
Replace Flow Sensor -
Call Service
AVM3-2 Pressure test
• Cannot be set to zero via
the analogue output
• Set DAC value greater
than 1,83V
• The amplifier circuit is not
working correctly
Retry function. Reboot
machine. If else fails call
service
Exchange the external flow
sensor
System Error
Cal Required - Call
Service
EEPROM is checked during the
start up and during the sensor
test for CRC errors
Take the machine out of use;
Call Service
Recalibrate the complete
system. If that does not solve
the problem exchange the
module 2
Calibrate Breathing
System
Perform Compliance Test
The checking of the solenoid
valves failed
Retry function. Reboot
machine. If else fails call
service
Check the correct voltage
supply for the solenoid vales. If
that does not solve the problem
exchange the according
solenoid valve
Insert Breathing system
The system does not detect a
signal from the stop switch in
the docking station
Insert Breathing system, else
call service
Test the correct function of the
stop switch in the service mode.
If the function ids OK, readjust
it’s positioning. If the function is
faulty, exchange the stop switch
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