![hvac - What does this square icon mean on my Honeywell thermostat? - Home Improvement Stack Exchange hvac - What does this square icon mean on my Honeywell thermostat? - Home Improvement Stack Exchange](https://i.imgur.com/YDEy7VR.jpg)
hvac - What does this square icon mean on my Honeywell thermostat? - Home Improvement Stack Exchange
I need a color coded wiring diagram for my Chronotherm IV Plus. I disconnected the wall unit and may have mixed up some
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