One note of caution on this whole Nest fiasco is this: If the Nest is
"fooled" by indicating that you don't have a C wire when you actually
do, is the device actually using it? That could be a problem as the
article below
suggests.https://smartthermo...
Bruce,I had the same problem, and your fix worked. However, I became
concerned that, even though the C wire was connected, the Nest device
was not using it, I.e. as if it did not exist. We have no easy way to
know without monitoring current flow. So ...