Lochinvar & A.O. Smith 100208305 Indicator Light You should consult the burner

You should consult the burner manifold specification or the parts list in the equipment service manual specifically for part number S1-9951-1361

this switch should be closed (0 ohms)

Engineered for the rigors of field use

always verify the specific part number on the existing sequencer's base or the unit data plate before installation

including popular configurations like the CWTF20 and CWTF35

Lochinvar & A.O. Smith 100208305 Indicator Light You should consult the burnerWhen you are troubleshooting Copper Fin II series units or A. O. Smith industrial water heaters, having a reliable visual reference for the 120V circuit status is critical. The Lochinvar & A. O. Smith 100208305 Indicator Light is the OEM direct replacement for the legacy MSC2448. This neon indicator light is designed for a precise snap in installation, ensuring a secure fit in the control panel housing without the need for additional hardware.