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Hello, tell me a lot about your technical skill sets and if you have a multi meter or not, and if you can the brand and model number of the thermostat, its on the back after you pry the thermostat from its wall mount plate,
We can go from there.
Here is the manual for that thermostat. See the right hand column under "heating System" it describes the "stg1" message as a normal operating signal.
Follow this instructions and let me know in detail how it goes on your end.
we can go from there without a time limit.