Two of my three nest therms work fine. One nest therm causes my heat pump to flip from cool to heat but only when it is connected to the nest app. My guess is that it is a wiring problem with my heat pump but I’m not sure. My HVAC guy just told me to not connect my thermostat to the app. That works but is hardly helpful as it is a nest thermostat and I need to control it like my other two therms
