I have a heat pump with auxillary heat and installed the thermostat yesterday. I’m having the same issues… If the system runs for 30 minutes, the auxiliary heat is kicking in. Even when indoor temp has reached the set point or even exceeded it by a degree. I’m measuring temps out of vents - up until the 30 minute mark, it’s blowing out mid to high 80s, then it hits 110-130 degrees once the heat strips turn on.
The thing is, it doesn’t need to be running for 30 minutes to begin with. I’ve been paying close attention to the cycles and measuring temp near the thermostat… When I have set point at 70, the thermostat indoor temp will get down to 69 and I can confirm that temp is correct with the other thermometer. BUT when the system starts up, the thermostat indoor temp reading drops to 68 within a minute, then 67 within the next minute. Meanwhile, my thermometer near the thermostat is slowly rising past 69. From there, the Wyze indoor reading is lagging behind the rest of the cycle by about 2-3 degrees. Once it shows it’s at the set point of 70, that’s actually 2 or 3 degrees lower than my other thermometer. By the time the thermostat hits 71 it’s been 30 minutes and it’s calling for auxiliary heat…even though the actual temp near the thermostat is 73-74. Then, the cycle ends with the thermostat showing an indoor temp of 72…which then jumps to 74 within a minute. Then the whole process repeats.
I called today hoping to get answers and to find out about where the temperature differential setting can be found, but they had to forward my questions via email to a specialist. Still haven’t heard anything back. I don’t understand why the thermostat shows an immediate 2 degree drop upon starting a heating cycle, but it’s causing a lag that makes the system run much longer than needed, which then kicks on the heat strips after 30 minutes because it thinks it’s colder inside the house than it actually is.