Before we begin answering the frequently asked questions, these instruction and installation guides may be useful:
Thermostat Harmony HMY110/HMY220 Operating & Installation
Thermostat NTG5110/NTG5220 Operating & Installation
Now on to your frequently asked questions about NuHeat thermostats!
What if my GFCI light is on?
What does an "LO" reading on screen mean?
What does an "HI" reading on screen mean?
How do I set the [...]