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Hello, that is usually a 'communications error' on some models, that is not repairable by the vast majority of home owners.
If you can tell me the brand and model number of your outside unit, and how old it is...I can be more helpful.
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That is a Ramsung model, made by Chigo, a chinese brand.
It can be difficult to get service on those in most areas, they will sell to anyone and the cost is low enough that dealers in US can't make money supporting the brand.