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Hello, these are electronically complex systems. I can take a look at it for you, but in the end you will most likely have to call a local shop that specializes in these type systems to do the repair.
I need to know how old the system is approximately,
Please attach a well focused, close up photo of the wiring diagram glued inside the service panel at the outside unit, you can use the paper clip icon at the right end of the toolbar at the top of this dialog box,
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. You will need a multi meter ($30 at a hardware store) and some experience working with appliances, let me know a lot about your skill sets in those regards.