What happens if expansion valve is bad?

If an expansion valve is bad, it can disrupt the refrigerant flow in an HVAC system, leading to insufficient cooling or heating. Symptoms may include ice buildup on the evaporator coil, reduced system efficiency, and fluctuating temperatures. Additionally, a malfunctioning valve can cause increased pressure in the system, potentially damaging other components. Ultimately, it may require repair or replacement to restore proper function.