Nordyne 626508R Limit Switch

The Nordyne 626508R is a critical high-limit safety component designed for residential gas furnaces and air handlers. This L250-40F limit switch acts as a primary safety sensor, monitoring the heat exchanger and plenum temperatures to protect the system from thermal damage. Factory-calibrated to normally closed (NC) specifications, the 626508R Auto Limit Switch will open the circuit to interrupt the burner if temperatures reach the 250°F cut-out threshold. Once the system cools to the 210°F reset point, the switch automatically resets to restore operation without technician intervention.

This OEM Nordyne replacement part is built with professional-grade phenolic housing to withstand the harsh environments of HVAC air handlers. It is commonly utilized across Intertherm, Miller, and Frigidaire units, ensuring precise fan limit control and secondary safety. When diagnosing a short-cycling furnace or a permanent blower run condition, verify the SPST contact integrity and ensure the 1/4-inch quick-connect terminals are securely seated to prevent high-resistance arcing.

Key Benefits

• 250°F Cut-Out/210°F Reset: Precise temperature differential prevents heat exchanger stress and nuisance tripping.
• Automatic Reset Logic: Eliminates manual restarts, ensuring the furnace limit control remains operational after a temporary overheat event.
• Broad OEM Compatibility: Verified for use in Nordyne, Maytag, Gibson, and Tappan gas furnaces.
• Durable Construction: High-temperature ceramic/phenolic materials ensure long-term HVAC safety switch reliability under thermal cycling.

Common Questions

• What causes this limit switch to trip repeatedly? Frequent opening often indicates airflow restrictions such as a dirty air filter, a failing blower motor, or obstructed ductwork.
• Is the 626508R interchangeable with manual reset switches? No. This is an auto-reset model. For safety reasons, never replace a manual reset limit with an automatic reset unless specified by the manufacturer.
• Will this fix my blower motor running constantly? A failed-open limit switch will cause the control board to run the blower continuously as a safety measure to cool the heat exchanger.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.