Electronic Leak Detection DOES WORK
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First, we did a standing pressure test for an hour.
Jesse then brought out the H10G (heated diode leak detector) and used the “small” setting. The ball on the inside was barely floating, and there was a significant lag in the leak detection. So, Jesse and Bryan replaced the pump, and Jesse picked up a leak much more reliably.
Bryan then used the Testo 316-3, another heated diode leak detector. (You have to watch out for false positives if you block the end of it.) The Testo 316-3 picked up a leak in nearly the same spot as the H10G.
There was some corrosion on the coils, but the leak was actually in the fin pack on the third row of tubing. We bent the fins out of the way to expose the coil and access the probable leak site. There was a nick on the copper tubing, and some soap bubbles confirmed that the leak occurred right at the site of the nick.