? For those with a 5 button duo therm thermostat and furnace w/heatpumps.
OK, I am starting to get upset at Duo Therm. We are now on our third 5 button thermostat in the last year. We had the original fail in December and replaced with new. Now the replacement failed and we purchased another one two days ago.
It's working but when I run the heat pump it will stop after some time and we can hear compressor running. I assumed it was pumping freon back into chamber.
Now the issue. Once the pump down happens the heat pump fan will come back on for about 5 seconds, shut off, and the furnace will come on.
Now I know we are in the low 40's from outside temps. I also know the heat pump is not very efficient at that temperature.
The previous thermostats never shut down heat pump and started the furnace as a alternative. The display on the thermostat still says in heat pump mode. Is it possible the new updated thermostat will automatically switch modes? Does anyone with one of these have similar results?
There's nothing in the manual that came with the thermostat that mentions doing something like this.