This messages indicates excessive run times. The first potential cause is a dirty condenser, thus the message. But a bad condenser fan motor or loose fan blade could cause the same problem. Also, very warm room temperatures could cause extended run times. It could be a faulty control, although this is unlikely. A bad compressor or low refrigerant charge might be the cause. Beyond cleaning the coil or replacing the condenser fan motor or blade you will want to request a qualified technician to check the unit and make repairs. Certified SubZero servicers can be located by entering your zip code at http://www.subzero-wolf.com/contact-and-support/index.aspx