York 025-26366-003 Fan & Limit Switch

The York 025-26366-003 Fan & Limit Switch is a critical OEM replacement part engineered for high-demand HVAC temperature control in specific York systems. This dual-function limit control switch operates with a temperature range of 110°F to 170°F and features an auto-reset mechanism to ensure continuous system protection. Designed for precision, this bimetal furnace switch manages both blower motor activation and safety high-limit cutouts, protecting the heat exchanger from thermal stress. It is a direct fit for York DCUC (090-120), DDUC (150), and PGM (090-120) units. For technicians troubleshooting short-cycling or blower-run issues, this 025-26366-003 limit switch provides the reliable mechanical switching required to restore furnace airflow management without the risks associated with universal aftermarket components. Ensure proper HVACR troubleshooting by verifying York furnace part compatibility with your specific model number before installation to maintain factory-spec safety parameters and efficiency.

Key Benefits for HVAC Professionals

• Direct OEM Compatibility: Specifically calibrated for York DCUC, DDUC, and PGM series to maintain original design intent.
• Broad Temperature Range: Operates reliably between 110°F and 170°F for versatile application in various heating profiles.
• Automatic Reset Logic: Features an integrated auto-reset limit switch that restores circuit continuity once safe temperatures are reached.
• Bimetal Durability: Robust construction designed to withstand the rapid thermal cycling typical of commercial and industrial package units.

Common Questions & Answers

What happens if the fan limit switch stays open?
An open limit switch typically breaks the circuit to the gas valve, preventing the furnace from firing as a safety measure. If you detect 24V on the line side but 0V on the load side while the unit is cool, the switch has likely failed and requires replacement.

Is this switch compatible with non-York systems?
This 025-26366-003 is an OEM York part. While some specs may crossover, it is strictly recommended for use in indicated York DCUC, DDUC, and PGM models to ensure accurate trigger points and mounting alignment.

Does this switch control the blower motor directly?
Yes, as a combination fan and limit switch, it manages both the furnace blower timing (turning the fan on/off based on plenum temperature) and the safety high-limit shutoff for the burners.

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.