I can tell you almost anything you need to know by reading the wiring diagram.
Please attach a well focused, close up photo of the wiring diagram glued inside the service panel, the picture needs to betaken from straight on, in very good light. If you can include a few photo's of the unit with the service covers removed, taken from about 8 feet away, that will help as well.
You can use the paper clip- icon at the right end of the tool bar at the top of this dialog box to attach it here. ,Include a picture of the thermostat wire connections to the printed circuit board in the same area.
If you have an error code showing, tell me what the code read out is on the wiring diagram or a sticker next to the diagram please.
If there is no paper clip-icon, look for the '+attach files'link at left of your send button.
I can mark it up with trouble shooting instructions if needed.
I am off to run some errands now, and should be back in an hour or so. I will pick up your response at that time.