Carrier HH18HC350 Rollout Switch 318423-701 This OEM Johnson Controls part

This OEM Johnson Controls part replaces worn or fatigued springs that cause hysteresis or failure to reach full stroke

factory-spec finish on CW Series models

Replacing the main valve spring and high-pressure gaskets ensures consistent seat-to-disc alignment

and filter monitoring where reliable electrical switching at specific set points is critical for system safety

ensuring the RTD sensor remains within its Class B tolerance specifications

Carrier HH18HC350 Rollout Switch 318423-701 This OEM Johnson Controls partThe Carrier HH18HC350 Rollout Switch is a critical safety component designed for high temperature monitoring in select Carrier, Bryant, and Payne gas fired furnaces and packaged RTU systems. This OEM flame rollout switch features a 350 degrees F fixed setpoint and a Single Pole Double Throw (SPDT) configuration. In the event of a "rollout" where flames escape the combustion chamber, the thermal sensitive coil triggers the manual reset rollout switch