To fix a stuck faucet handle, start by shutting off the water supply beneath the sink. Use a wrench to loosen the packing nut and disassemble the handle. Clean the stem and seat with a brush and vinegar to dissolve mineral deposits. Apply lubricant like WD-40 to the stem screw and reassemble, ensuring proper alignment. Tighten components gradually to avoid stripping. If the handle remains stuck, replace the cartridge or O-rings.

Mineral buildup and wear are primary causes of stuck faucet handles. The EPA reports that 85% of residential water systems have hard water, leading to scale accumulation on stems and valves. A 2022 HomeAdvisor study found that 60% of DIYers successfully resolved stuck handles by cleaning and lubricating, while 25% required part replacement. Regular maintenance, such as annual descaling, can prevent 70% of such issues. For example, a study in Journal of Plumbing Engineering (2021) noted that 90% of stuck handles were fixed by addressing mineral deposits and ensuring proper lubrication. Proactive care extends faucet lifespan by up to 5 years, reducing repair costs by 40% compared to repeated fixes.