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Testo 320 will not read CO2
Testo 320 was brand new about 6 months ago, I've used it maybe 10-15 times and kept up on drainage and filter changes, everything by the book. Today I fired up a UFT-120 heating a new 5000 sq ft house and 1500 sq ft attached garage and the Testo would not read CO2 (or efficiency). The boiler was converted to LP with a new mixer from HTP and seemed to be burning nicely through the sight glass but neither low or high fire showed any sign of CO2. I was able to dial the PPM down to around 100 but nothing further. Do these have a separate sensor for CO2 or what the heck? I'm admittedly new to the combustion analysis world so please excuse me if this is a stupid question, but I need to get this thing running ASAP and have another one to install tomorrow. Thanks in advance for any information!