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Tell me please how old the system is, and what the service people have to say about the situation if anything.
I need the brand and model number of the thermostat.
Please attach a well focused, close up photo of the wiring diagram glued inside the furnace blower service panel, the picture needs to be taken from straight on, in very good light.
You can use the paper clip- icon at the right end of thetool 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 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.
We can go from there.