Finally got to swapping out the nest thermostat for my old 'dumb' one.
The problem (heat for 10 mins then stop even though the desired temp
hadn't been reached) still existed. Good news - it isn't the nest
thermostat. Had a service tech out this morn...
I'm sure mine is also not a wiring issue - ran great for a year.
Originally, I thought it was the furnace, but I'm starting to think it's
the Nest thermostat (that's why I'm going to test it by swapping with
the 'dumb' thermostat). My initial thought...