Hey guys, I've been having some issues deducing where a leak is coming from. My leak detector doesn't seem to pick anything up. I found some oil and felt minor flashing at the coil's flare kit nut once the system was running. I also found signs(copper was turning green on the outside) that it had frozen around the same area going into the coil. When I went to install the new flare kit at the coil I noticed the washer inside of the fitting had turned blue(originally white). This is on a lennox 2 ton horizontal 410 coil. Has anyone seen this?
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