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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! If the parameter value will not adjust, there is an issue with the electronic control. Try unplugging it for at least 15 minutes. Will it then allow programming?
It sounds like the main electronic control is faulty then. However, I have limited experience with this unit so am going to place your question back to the list for others to see. Perhaps another has more first hand experience with this exact model.