How to clear/deal with "contamination" error on stryker insufflator

Hey guys, I have a stryker insufflator. When it starts to self test it abruptly starts to sound an alarm and end with "Contamination". Does anyone know what could a possible problem and solution. If there is anyone with such knowledge please help. Again if both user and service manuals are available I also pray them to share. vgmakwinja@medcol.mw Thanks in advance. Victor.