When I left my house for a few days for Christmas, I expected HVAC to go into the low temperature 'fallback' mode 24 hours after I left the house.
In practice it never did - some of my PIR sensors sometimes signal presence even when the house is unoccupied. It is probably due to hot air movment, sunlight operation or other random factors.
I had such 'false' signals almost every day and the system never had a 24 hour window to switch into fallback mode.
It is easy to make the alarm subsystem ignore 'false presence' indications by setting the number of movments necessary to trigger the alarm > 1.
Is there a way to do something similar with All HVAC, so that it would go into (or remain in) fallback mode despite single movment sensed by individual PIR-s?