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That is a "Hi Limit" error code and open up the outside inspection cover and see if there is a small black "box" attached to the cooling unit coils and is the red light on? These are tripped by too much heat on the flue OR low voltage can do that and this may have happened. It can be reset, but we need to determine what caused it first. Get back to me with this and we can go from there and sort this out for you.