While some mounting patterns may appear similar across generations

Replacing the old sensor typically restores consistent pilot operation

The 5/32" outer diameter tubing is optimized for standard pneumatic fittings

the HH18HA141 features an auto-reset function that re-establishes the circuit for continued operation

This part is specifically engineered for Lennox HVAC models such as the AF90MPB

Lochinvar & A.O. Smith 100112662 High Limit Els PW 29614 While some mounting patterns mayThe Lochinvar & A. O. Smith 100112662 High Limit is a critical OEM safety control designed to prevent terminal damage in high output commercial and residential heating systems. Engineered for hydronic boilers and gas water heaters, this 165 degree limit switch monitors internal temperatures and breaks the electrical circuit if limits are exceeded. As a manual reset safety switch, it requires technician intervention to investigate the root cause of an