How do you tell when a Dual stage furnace is in high or low
Most stats have a low/high fire indicator.
The thermostst is a Honeywell Focus Pro TH 6220D
The stat won't have anything say hi or lo fire..
You can tell by the blower sound.. Low will be quieter, and high will notice a higher blower speed.
On my Vision Pro, I wired the w2 to light up the red LED.