LB White High Limit Switch #505566
Critical Safety Component for Heater Overheat Protection.
LB White high limit switch is an essential safety replacement for Classic® 60/115/170 and Guardian® 75/250/325 propane and natural gas heaters. This manual-reset limit switch cuts power when temperatures exceed 350 °F, preventing potential heater damage or fire hazards
LB White products are built to endure barn environments. This switch includes mounting tabs for secure installation and clearly labeled terminals for accurate wiring. When temperatures return to safe levels, the operator can easily reset the switch using the red manual button—restoring normal heater operation without replacing the entire unit. It’s a trusted OEM part from LB White, designed to maintain safe functionality with minimal downtime.
Key Specifications:
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Switch Type: Manual-reset high limit
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Temperature Limit: 350 °F
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Compatible Heaters: Classic 60/115/170 & Guardian 75/250/325 (Propane or Natural Gas)
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Electrical Rating: Typically used with heater’s gas control circuit
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Mounting: Dual-tab bracket design
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Part Number: 505566 (replaces 05566)
Installation & Maintenance Tips:
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Power off and disconnect the heater before servicing.
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Access and unmount the old limit switch from the heat chamber.
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Disconnect wiring, noting terminal locations.
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Install the new switch, secure mounting tabs, and reconnect wires.
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Power on heater, run to temperature and test reset functionality: heat until limits open, then press reset button once cool.
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Test annually and clean the heat chamber to prevent false triggers
**** For use in all LB White heaters EXCEPT the Guardian 60 and Guardian 100 models.