Where is this limit switch usually located

Accurate diagnosis requires testing with a multimeter to ensure the microfarad reading remains within the +/-5% tolerance range

screw holes

refer to your specific model’s parts list for secondary fitting requirements

Lennox 18M84 Limit Switch Els PW 17895 Where is this limit switchProfessional grade Lennox 18M84 limit switches are critical safety components designed to regulate internal furnace temperatures and protect heat exchangers from thermal stress. This OEM Lennox limit control features a 3 inch insertion depth and is factory calibrated for an auto reset range of 230 260F. As a normally closed switch, it breaks the electrical circuit to the gas valve if the plenum temperature exceeds the 260F threshold, typically caused