It's been working fine for years. Now the heating stops and the dial
reads heat stage 2, but I have no stage 2 system. Why would this start
happening, and how can I fix it?
HVAC guy checked the Nest - all o.k., but wired as if I had a stage 2,
which I don't. Furnace regulator failed, new one ordered. Hope it fixes
the problem (fingers crossed).
