Arrived to service call performed system evaluation. Customer changes filters regularly. Condenser clean. Tested capacitor and compressor amp draw. Refrigerant levels in range. Amp draw on condenser motor was over amping and from the sounds the problem customer was describing sounds like defrost board was intermittently sticking. Customer stated system was on heat and condenser was running but fan was not and top was burning hot. As a precaution i replaced both parts. System heating and cooling at time.