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I have 2 - Ecobee 3’s in my Home. One for each floor.
Heat Pump - Air to air
O/B Rev Valve - Energized on cool
Aux simul - enabled
Auto - enabled
Heat/cool delta - 5*
Compressor min cycle off time - 300sec
Compressor min outdoor temp - 10*
Ac overcool - disabled
Aux heat outdoor temp - 25F
Heat diff temp - 1.0F
Heat Dissiption Time - Auto
Aux min Time on - 7 min
Cool diff temp - 0.5
Cool dissiption time - auto
Compressor min time - 5 min
Compressor to aux run - auto
Auto reverse - off
I’ve had some issues with one of the thermostats almost continually since I’ve owned them.
Starting last winter, the downstairs unit was unable to keep the house warm. So, just to check the thermostats, I swapped units. Brought the upstairs unit downstairs and took the downstairs unit upstairs. Everything went fine.
The swap seemed to work. Then upstairs stopped heating. Called the help line and I was able to get it working well enough.
It won’t heat above 68, it won’t cool below 72, and while this isn’t functioning as it should, it is workable with the residual heating/cooling downstairs.
If you try any parameters outside of this 68-72 band, it seems resets itself and loses its mind.
I’ve switched the units between upstairs and down multiple times to isolate an HVAC equipment issue. Both thermostats are wired the same and work correctly 75% of time.
Last night my downstairs thermostat stopped working. 11* Outside and my thermostat gave up the ghost. Woke up to 50*F in the House and the thermostat calling and apparently thinking the heat was on with nothing working. No heat.
I ran the “test the equipment” function. I was able to make everything work except for any heating.
So, I completely reset the downstairs thermostat. Plugged, unplugged, etc. Nothing helped.
Then decided to swap thermostats, “worked” last time, might as well give it a shot.
Brought my upstairs unit back down from last years “swap” and took the downstairs up.
Now I have heat. Everything is “fine” at the moment.
Anyone wanna take a stab at what’s happening here?