York S1-025-35397-000 Limit Control

The York S1-025-35397-000 is an essential manual reset limit control engineered for precision thermal monitoring within high-efficiency furnace heat exchangers and air handling units. As a genuine OEM York replacement part, this HVAC safety switch is calibrated to provide high-limit protection by breaking the electrical circuit to the gas valve or ignition control if internal temperatures exceed factory safety thresholds. Unlike automatic switches, this M/R control requires a professional technician to physically reset the device, ensuring that the root cause of the overheat—such as a failed blower motor, restricted return air, or a clogged filter—is addressed before the system is allowed to cycle again. The component features a high-grade bimetal sensor and standard terminal spade connectors for a secure, low-resistance connection within the low-voltage safety loop. Utilizing this furnace limit control maintains the operational integrity and safety standards established by the original equipment manufacturer during system commissioning.

• OEM Compatibility: Precision-engineered for a drop-in fit in York, Coleman, and Luxaire furnace cabinets, ensuring electrical and physical alignment.
• Manual Lockout Safety: Prevents the unit from "short-cycling" on a limit, forcing a diagnostic check of the airflow and combustion deck.
• Industrial Build Quality: Constructed with high-temp resistant polymers and a responsive bimetal disc for accurate thermal cut-off.

Common Questions

How do I identify a tripped York S1-025-35397-000?
Check for continuity across the terminals. If the circuit is open and the furnace is cold, press the manual reset button located between the terminals until it clicks to restore the circuit.

What are the most common causes for this limit to trip?
In most field applications, this switch trips due to reduced static pressure, a dirty evaporator coil, or an undersized return air drop that causes heat to build up at the heat exchanger.

Can this manual reset switch replace an auto-reset limit?
No, safety controls should never be downgraded. Always replace a manual reset limit with the specified York S1-025-35397-000 to maintain UL listing and equipment safety protocols.

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.