Common Questions What is the function of an SPNO switch in this York unit

such as the TD114

Always check for a restricted sensing bulb or a stuck internal needle before replacing

providing a reliable electrical path that triggers the burner circuit to de-energize when water levels fall below safe parameters

Robertshaw 10-661 Link Kit R-448A Common Questions What is theThe Robertshaw 10 661 Link Kit is a specialized safety component engineered for thermal protection in HVACR systems, specifically designed as a fusible link kit BDP replacement. This professional grade two pack fusible link is critical for field technicians servicing older Carrier and BDP gas furnaces. These links are manufactured to act as a secondary safety limit, designed to melt and interrupt the electrical circuit if internal furnace temperatures