Common Questions When is an isolation relay kit required for a heat pump

replacing the factory wiring to restore reliable motor communication

For contractors managing HVAC gas valve troubleshooting

Designed for professional HVACR control applications

If 24V is present but the contacts do not pull in

Lochinvar & A.O. Smith 100271315 Limit Switch 30067439-890 Common Questions When is anThe Lochinvar & A. O. Smith 100271315 Limit Switch is a critical safety component engineered for high performance hydronic and water heating systems. As a veteran technician knows, maintaining the integrity of the safety loop is non negotiable. This OEM high limit switch is designed to monitor outlet water temperature and provide a positive safety shutdown by interrupting the electrical circuit if temperatures exceed the factory set threshold,