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It means you have lost power. It could be due to a power outage or brownout. Check the user interface, control board, harness, etc. It may also have a short. In that case, consult a professional to check the unit.
The control panel has a flat ribbon cable that plugs into the relay
module. The ribbon is actually two ribbons pressed together. The
plastic insulation has a defect, and the leads between the two ribbons
cross. You can seperate them easily by lifting them apart. Place a
piece of paper between them to act as an insulator. This should solve