My unit was working great a couple of months ago, but I am experiencing some issues now that the weather is colder. I began getting a "Compressor Low Suction Temp" fault. My unit, a Daikin McQuay 4 ton, will reset once and then shut off compressor on second fault. I originally suspected low glycol level, it was around 10%, but now I have it at 30% and am still getting the same fault. I am trying to check the water temps but don't have a probe type thermometer. I have an infrared gun. Will checking the fitting temps with that be accurate?