Just installed a dual fuel unit and I cannot get the unit to swith while running.
On a call for heat it picks heat pump or Gas correctly.
while the system is running and the temp goes above or below the balance point the system will not switch. I am using an 8000 tstat.
I tested this by putting the sensor in ice or pulling it out of ice.
I have ask around and am getting mixed opinions on this.
what does it take to make the unit switch while running. My thinking is that while in cold weather, during heat pump mode, the system could never actually meet the set point and thus never switch to gas.
do I need a 9000 tstat or fossis fuel kit.