Mindray WATO EX-55Pro, Service Manual

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4-25
NOTE

In case of leak test failure, check all of the possible leak sources, including bellows,
breathing system tubes and CO2 absorbent canister. Check that they are correctly
connected and their connectors are not damaged.

If there is indeed a leak, check the pneumatic circuit system for leakage and
troubleshoot the problems as described in section 8.3 Leak and Compliance Tests.

After leak failure is troubleshot, do the leak test again and make sure the test is
passed.
4.11.4.2 Commonly-encountered Problems and Recommended Actions
The following table lists the commonly-encountered problems and recommends actions for
breathing system leak test in mechanical ventilation mode.
Failure description Possible cause Recommended action
Leak test failure is
prompted
immediately after
[Start] is selected
(typically, the leak
test requires at least 3
minutes). The bag/vent switch is set to the bag
position and the message [Manual
Vent.] is prompted. Set the bag/vent switch to the
mechanical ventilation position.
The reading on the drive gas (O2)
pressure gauge indicates drive gas
pressure low (lower than 200 kPa)
and the alarm of [Drive Gas
Pressure Low] is produced. Replace or connect gas supplies
and make sure that the drive gas
pressure is at 280 to 600 kPa.
The ACGO switch is turned on and
the screen displays prompt message
of ACGO. Turn off the ACGO switch.
The airway pressure
does not drop during
the test but test
failure is prompted. Fresh gas is not turned off. Turn off the fresh gas.
During leak test, the
pressure indicated by
the airway pressure
gauge fails to reach
30 cmH2O. 1. Before the leak test, the bellows
is not fully inflated.
2. The Y piece on the breathing tube
is not connected to the test plug.
3. The bellows housing is not
properly installed.
4. The CO2 absorbent canister is not
installed in place. Check the pneumatic connections
and re-install the pneumatic
circuit.
During leak test, the
pressure indicated by
the airway pressure
gauge reaches 30
cmH2O but then falls
rapidly. 1. The bellows housing may not be
installed properly.
2. The expiratory valve assembly is
leaky.
3. The circuit is not tightly
connected to the circuit adapter.
4. The connection between the
sampling line of the sensor and the
board is leaky.
Check the pneumatic connections
and re-install the pneumatic
circuit.
After the leak test,
the alarm of
[Ventilator Hardware
Error 11] occurs. Control of safety valve by the
auxiliary control board fails. Restart the machine. Verify if the
safety valve is controllable by
using the safety valve control
command of the monitor board. If