Response to Hi, Jeffrey. The LO error code references the Limit string open error. You will need to check the Limit Switch - FDXLHLI1930 or the Integrated Control Board - FDXLICB1930 to find out which part is bad and will need to be replaced. Also, it could be a bad Water Pressure Switch - FDXLWPS1930, confirm that the unit is getting at least 30 GPM. 

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