What are some common problems with Goodman heat pumps?

What are some common problems with Goodman heat pumps including GSZ14 14 SEER single stage, GSZC16 16 SEER two-stage, and GSZC18 18 SEER variable speed include capacitor failure, defrost board issues, and refrigerant leaks similar to other brands but with Goodman-specific frequency. First, capacitor failure after 5 years causing outdoor unit not starting and buzzing noise, capacitor provides start boost to compressor and fan motor, fails due to heat, costing 150 to 300 dollars installed, common to all brands. Second, defrost control board failure after 7 to 10 years causing outdoor unit icing up in winter and not defrosting, showing ice buildup on coil, reducing heating capacity, costing 200 to 400 dollars to replace board. Third, refrigerant leak from evaporator coil due to formicary corrosion after 5 to 8 years causing low charge, poor heating and cooling, ice buildup, costing 600 to 1,200 dollars to replace coil. Fourth, contactor failure after 7 years causing unit not turning on, costing 150 to 250 dollars. Fifth, reversing valve failure after 10 years causing unit stuck in cooling mode not switching to heating, costing 400 to 700 dollars. Sixth, dirty outdoor coil causing high head pressure trip. Overall service rates around 10 to 13 percent indicate decent reliability for price, slightly higher than Trane at 8 to 10 percent but acceptable. Regular maintenance with coil cleaning twice yearly, filter changes every 2 to 3 months, and annual tune-up at 100 to 150 dollars prevents most common problems and extends life to 14 to 18 years.