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The Carrier HH18HA420 Auto Limit Switch is a critical HVAC safety device designed to monitor internal furnace temperatures and protect the heat exchanger from thermal stress
Simplified Installation: Extended sweat ends protect internal seals from heat damage during brazing
As with all furnace ignitors
Wires should be inspected during every seasonal maintenance
Lochinvar & A.O. Smith 100111778 PCB Assembly 340155-7026 The Carrier HH18HA420 Auto LimitThe Lochinvar & A. O. Smith 100111778 PCB Assembly is a direct replacement integrated control board designed for high efficiency commercial water heaters and boilers. This OEM control board serves as the primary logic processor, regulating ignition sequences, flame sensing, and temperature modulation to ensure precise thermal output. Engineered for rigorous duty cycles, the 100111778 circuit board utilizes a robust architecture to manage communication
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