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Hi my name is Robert
Try this, turn the T-stat OFF, hold the top and bottom buttons, while holding the top and bottom buttons turn the thermostat ON, you should see FF once you see that release and see f the thermostat responds..... Also if you went from a four button thermostat to a 5 button please let me know....... Robert
Hi was just checking in to see if my answer helped, IF you have more questions or concerns please feel free to contact me... Robert