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it is a Honeywell-manufactured L4064B series control used across various brands like Allied Air
minimizing unnecessary service calls for simple transient overheat events
hold the zero button
Diagnostic codes are typically printed on the furnace blower door or the board's protective housing
Genuine OEM Build: Specifically engineered for York S1-025-27747-012 specifications
Laars Heating Systems R0023000 Limit Switch 322055-301 it is a Honeywell-manufactured L4064BThe Laars Heating Systems R0023000 Limit Switch is a critical safety component engineered to provide overheat protection for high performance hydronic and pool heating systems. This 150F high limit switch is calibrated to automatically interrupt the electrical circuit when internal water temperatures exceed the 150F threshold, effectively preventing thermal damage to the heat exchanger and downstream piping. As a veteran grade OEM replacement part,
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