The S1-024-25953-000 is built with a robust

a different part number from the T-4000 series is required to ensure the logo and faceplate align correctly

verify the assembly part number to ensure all required combustion air adjustments can be made

Can this ignitor be used in modulating-condensing boilers

while the L-M1 contacts close on high pressure to trigger notification systems

Carrier HH18HA502 Limit Switch 323055-751 The S1-024-25953-000 is built withThe Carrier HH18HA502 Limit Switch is a critical OEM high limit safety device designed for furnace temperature regulation in residential heating systems. Operating with a 140 180F temperature range, this component monitors the internal heat exchanger environment to prevent catastrophic failure and ensure safe operation. As an auto reset hi limit switch, it automatically restores the circuit once temperatures drop below the specified threshold,