03-05-2024 08:35 AM
I had a Nest Learning work for about 18 mos.
3 weeks ago aux heat stopped working - however it worked in Test via the stat.
Dual Fuel System, Electric Heat Pump(w/Rev. valve), Gas Furnace - the signals to run are routed through the HP control board.
After ~6 hours with google, they sent a new stat - exact same issue.
Furnace tech did a factory reset, on the new t-stat, things started working.
Last night the same thing happened, no aux heat(we are below lockout temp for HP), and now no fan either.
Individually the components work in test mode.
I am struggling to determine if this is a Nest issue or a local control issue.