Troubleshooting the Unsuccessful “Self Diagnostic Test “

This article will show how to troubleshoot the failed self-diagnostic test.

In Freedom EVOware software® it is possible to run the self-diagnostic test for AirLiHa to check for leakage and proper operation of the PMP. A “self-diagnostic test” is based on the PMP leakage test of S&S and is also available in the application Freedom EVOware software. Similar to the “Inline Filter Test” the affected channel should be inactivated if the test fails.



It is possible that if this test fails (even there is no issues with the pipetting of the instrument) there are different scenarios why this may be the case:


Scenario 1

The “height above sea level “ setting is not correct. Since this test is based on pressure, the height for this test is important to be set accordingly. The height above sea level can be set in the Evoware.opt file which is located in the <install_path>/Database directory. The settings for the height can be found under the [SelfDiagnosticsTest] section in the evoware.opt file: 


Configuration files are protected with a checksum, meaning when Freedom EVOware is re-started, after editing the evoware.opt file, a warning will appear stating that the checksum is invalid. To validate the checksum, you can proceed as follows:

  • Quit Freedom EVOware
  • Start the Configuration Tool with Start > All Programs > Tecan > EVOware > Configure. There will be a warning again that the checksum is invalid, You will be asked if you want to repair the checksum.
  • Click validate.
  • Then click EXIT on the Configuration standalone tool and re-start Freedom EVOware.



Alternatively, one can repair the checksum by using the validate configuration tool. If this is done a list of configuration files will be shown (see figure below). A green icon indicates that the checksum is correct. A red icon indicates that the checksum is not valid and needs to be validated. Please select <install_path>/Database/Evoware.opt (a) and validate that file by clicking the large green arrow at the bottom (b).



Scenario 2

The space between the pipetting, tubing, and the inside wall of the DiTi cone is wet. Thereby, the pressure sensing function will be impaired. This can happen if the DiTi cone was immersed by mistake in the sample or if pipetting was performed with the pipetting tubing pushed into the cone after a crash. In case of malfunction due to this circumstance, the DiTi cone and needle tube needs to be removed and cleaned.

For the removing, re-installing, and cleaning of the DiTi kit multisense, please consult the Freedom EVO Operating Manual.


Scenario 3

The PMP pressure sensor cable is defective. This issue cannot be resolved without help from a Field Service Engineer.


Further Help

For further help, please refer to our Helpdesk.


Link to Tecan Product Page:

Freedom EVOware®