Is your Goodman heat pump not heating, cooling, or stuck in defrost? This quick guide covers the essentials: confirm thermostat settings, replace or clean filters, clear return and supply airflow, check breakers/fuses, and gently rinse dirty outdoor coils. In cold weather, allow time for defrost to finish. You’ll also learn the warning signs of bigger problems—low refrigerant, failed capacitor/contactor, or a stuck reversing valve—so you can rule out simple fixes and know when it’s time to call a licensed HVAC professional.