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Hello, tell me please if the heating and air conditioning work well or not regardless the red light...and confirm that red light is on the thermostat or on the furnace/air handler.
we can go from there
Click here please... is this what you have?
Honeywell apparently sells these to Aube
This should be the manual for it Click here
see page 13 and tell me if the thermostat is operating at the preset temperature range or not, and if that is the LED thats glowing red or not.
We can go from there