Maintenance and Calibration
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3.3 Troubleshooting Guidelines
1. Identify the problem – Due to the wide variety of potential symptoms, certain problems may be
more subtle than others. Following the guidelines of the tests will help determine the problem if
one exists.
2. Avoid shorting component leads together – During repair procedures, it can be tempting to
make a quick series of measurements. Always turn the power off before connecting and
disconnecting the test leads and probes. The accidental shorting of leads can easily stress the
components and cause a second failure (aside from the safety risk).
3. Use the proper equipment – The equipment listed below is suggested to fulfill a wide range of
troubleshooting requirements. It is imperative to use the designated equipment in order to ensure
proper results of any and all test procedures.
4. Clean up the repair area – After any repair, clean off the repair area.
3.4 Troubleshooting Charts
3.4.1 Error Messages during ventilation
Display message Cause Corrective action User
Corrective action
Service technician
Vent Error:
Use Manual Ventilation
Call Service
No communication between
AVM 3-1 and AVM 3-2
(ventilator microprocessor
boards) for more than 8 sec.
Finish the case with manual
ventilation;
Take the machine out of use;
Call Service
Exchange module 2 (ventilator
microprocessor boards)
CPU Error: Use Manual
Ventilation
Call Service
No communication
between AVM 3-1 and module
1 (user interface) for more than
20 sec.
System Failure (Module 1)
Watchdog Error (Module
2)
Finish the case with manual
ventilation;
Take the machine out of use;
Call Service
Exchange either the module 2,
the module 1 or the
communication cable
connecting the two modules
Set APL valve to
CMV/SP position
AVM3-2
PPEAK is greater than 10 mbar
and lowest expiration pressure
after the expiration still greater
than PPEAK–2mbar
No pressure relief in the
expiration
Set APL to the CMV/SP
position
Reset automatically after
pressure relief, Restart of the
ventilation after request.
If resetting the APL valve does
not solve the problem, check
the correct functions of the APL
valve, solenoid valves and the
diaphragm valves
Flow Error: Use Manual
Ventilation
Call Service
CMV, PCV
After the first five breaths in
CHILD resp. after the first three
breaths ADULT: Last
inspiratory flow is lower than
0,05 L/min, even though more
than 2.00 L/min were set at the
prop. valve
Sensor does not deliver any
values
Finish the case with manual
ventilation;
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
Valve Error:
Use Manual Ventilation
Call Service
AVM3-2 CMV
The internal actual flow value is
measured during the inspiration
and may not exceed the
following desired value x factor
1.5:
AVM3-2 PCV
The same as CMV, but other
tolerance
Prop. Valve faulty
The intermitting tone is reset via
the mute button
(acknowledgement)
Reset the error message via
the compliance test
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
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