There was an electronic Gas Blender Error – Code E19, in the preoperative period.  

The error code appeared continually on the electronic blender without an audible alarm from the blender itself.  There was however a continual audible and visual alarm from the system display module.  

When the error message was displayed, there was still flow through the oxygen tubing and oxygen concentration had not been affected, however the error message remained and could not be reset.  

This alarm is not referred to in the manufacturers manual.  

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