Can you replace a 165 vac capacitor with a 220 vac capacitor?

Yes, you can replace a 165 VAC capacitor with a 220 VAC capacitor, as the higher voltage rating means the 220 VAC capacitor can safely handle the voltage without risk of failure. However, ensure that the capacitance value (measured in microfarads) is the same or compatible with the circuit's requirements, as using a capacitor with a different capacitance can affect the circuit's performance. Always check for physical size and mounting compatibility as well.