Customer has 11 y/o 2-zone Nordyne heat pump system that operates for whole house. System was not cooling properly due to damaged low voltage wiring causing reversing valve to not engage in cooling. Rewired thermostats, zone control board, and defrost control board. Tested system from both thermostats. Pressure levels were normal. Condenser electrical components are fair. Water protection is poor. Blower wheel cleaning needed. Significant presence of mold within air handler. Recommend UV BlueTube to target and prevent mold. Replaced 16x20x1 filter. System is currently working.