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Hello, I need the brand name of the unit and its model number, approximate age and a description of its function.. is it an air conditioner, furnace, pump system? etc.
If its a furnace, heat pump or air handler,
Please attach a well focused, close up photo of the wiring diagram glued inside the service panel,you can use the paper clip icon at the right end of the toolbar at the top of this dialog box, Include a picture of the thermostat wire connections to the printed circuit board in the same area.
If there is no paper clip icon, look for the '+attach files' link at left of your send button.
We can go from there.