and (4) replacement screws for a full hardware refresh

Precision Balance: Factory-balanced design reduces vibration

Advanced Diagnostics: Integrated LED status light simplifies HVAC system diagnostics by flashing specific fault codes

Standard HVAC technician tools are sufficient

Can I use the 48166902K to replace the 48166901 model

Lochinvar & A.O. Smith 100110744 Switch 326070-701 and (4) replacement screws forThe Lochinvar & A. O. Smith 100110744 Switch is a critical OEM replacement component designed for integrated power control within high efficiency residential and commercial water heating systems. This water heater power switch resides on the main control panel, providing a direct interface for technicians to verify circuit continuity and manage system states during troubleshooting or routine maintenance. Engineered as a genuine A. O. Smith replacement