The answer to 'how to fix ceiling fan installation' is to first turn off the power to the ceiling fan at the circuit breaker. Then, remove the old fan and inspect the electrical box to ensure it is securely mounted and can properly support the weight of the new fan. Next, connect the wires according to the manufacturer's instructions, making sure the ground wire is properly connected. Finally, install the new fan blades and test the operation to ensure it is working properly.
It's important to follow all safety precautions when working with electrical wiring, such as turning off the power, using insulated tools, and avoiding contact with live wires. If you're not comfortable with electrical work or the installation seems complex, it's best to hire a licensed electrician to ensure the job is done safely and correctly.