Bubbles usually signify a lack of subcooling

and 53 series brackets

technicians can eliminate common issues such as coil freeze-ups and improper reversing valve operation

Field-fabricated conduit often lacks the exact multi-pin connectors or moisture seals required for these specific electronic controls

Direct OEM Compatibility: Engineered for a perfect fit in Carrier

Lennox 78W99 Limit Switch 321894-706 Bubbles usually signify a lackThe Lennox 78W99 Limit Switch is a critical safety component engineered to regulate heat exchanger temperatures within Lennox G40, G41, G50, G51, and G61 gas furnaces. This L235 30F thermal limit control features a fixed temperature setting, designed to open the electrical circuit at 235F and automatically reset once temperatures drop by a 30F differential. Precision calibrated for high limit protection, this SPST (Single Pole Single Throw) switch