Not off to a great start

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Thank you. I replaced that valve instead next to the orange pump. You were right as that is why the test chamber wasn’t filling.

I’m still not getting readings though. Any idea what might be causing this problem?

The solution is showing multiple colors, this might indicate a contaminated syringe or test chamber. Kindly replace the syringe, clean the test chamber with some soap and warm water, and try again.