If the compressor is humming but failing to turn over

the 621679R utilizes standard 1/4" quick-connect spade lugs for direct integration into existing control boards

making it suitable for high-pressure R-410A systems

it provides superior protection for expansion valves and compressors by capturing solid contaminants like metallic debris and sludge

Lennox 71J07 Limit Switch If the compressor is hummingThe Lennox 71J07 Limit Switch is a high precision, normally closed safety component designed for critical temperature regulation in heating systems. Engineered by Therm O Disc (Model 36TX11, 36T series), this disc style limit switch features an automatic reset function that ensures seamless system recovery once temperatures stabilize. With an open temperature threshold of 175F and a close temperature of 155F, this L175 20 limit switch effectively