Nordyne 626456R Limit Switch

The Nordyne 626456R Limit Switch is a critical high-limit safety component designed for precise thermal regulation in residential furnaces and forced-air heating systems. This OEM Nordyne replacement part operates with an L135-30F fixed setting, meaning it is engineered to open the electrical circuit at 135?F and automatically reset when the temperature drops to 105?F. For veteran techs, this 105-135F auto limit switch is the standard solution for furnace short cycling or blower motor malfunctions caused by overheating. Compatible with a wide range of brands including Intertherm, Miller, and Frigidaire, this switch ensures the heat exchanger does not reach hazardous temperatures if airflow is restricted by a clogged filter or failing inducer motor. Its snap-disc construction provides reliable continuity in the closed position, protecting the furnace control board and preventing potential equipment damage. When diagnosing HVAC high limit trips, this 120/240V capable switch offers a direct-fit, professional-grade solution for restoring safe system operations.

• Precise Thermal Protection: Fixed 135?F open and 105?F close points prevent heat exchanger cracking and ensure localized safety.
• OEM Compatibility: Replaces older part numbers 626456 and 300609008 across Nordyne and Nortek brand families.
• Automatic Reset: Eliminates manual intervention by restoring the circuit once temperatures return to safe operating parameters.
• Durable Snap-Disc Design: Engineered for high-cycle reliability in demanding HVAC ducting environments.

How do I confirm the 626456R is faulty?
If the furnace plenum is cool but the switch remains open, or if you measure infinite resistance (OL) on a multimeter while the switch is at room temperature, the internal contacts have likely failed and require a replacement.

What causes this limit switch to trip repeatedly?
Frequent trips are typically caused by restricted airflow. Before replacing the switch, check for a dirty furnace filter, blocked return air grilles, or a failing blower capacitor that may be slowing the fan speed.

Can I use this switch in a mobile home furnace?
Yes, this is a common Miller/Intertherm limit switch used in many mobile home and manufactured housing units. Always cross-reference the temp code stamped on your existing bracket to ensure a proper match.

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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.