Lennox 26W42 Pressure Switch

The Lennox 26W42 Pressure Switch is a critical OEM component designed for high-efficiency two-stage furnace operation. Engineered to monitor and regulate inducer motor performance, this switch features precise dual factory-set points of 0.55" W.C. (Low) and 0.95" W.C. (High). As a veteran-grade HVAC replacement part, it ensures the sequence of operation is maintained by verifying proper vacuum pressure before allowing the ignition process to proceed, protecting the system from venting failures.

This 2-stage pressure switch (Model 101126-03) utilizes a SPST-N.O. configuration and is rated for 5 Amp resistive at 24 VAC. Technicians typically find this part in Lennox G61MPV series units and high-performance models from Allied, Armstrong, and Ducane. Its robust construction handles the high-cycle demands of modern heating and cooling systems, providing a direct-fit solution for furnace repair professionals looking to restore original factory pressure monitoring specifications.

• OEM Compatibility: Exact Lennox replacement part for unified fit in Lennox, Armstrong, and Ducane high-efficiency furnaces.
• Precise Two-Stage Logic: Calibrated .55/.95 WC set points ensure accurate low and high-fire induction monitoring.
• Industrial Durability: Rated at 5 Amps for 24V circuits, built to withstand the demanding environment of an inducer housing.
• Safety Compliance: Prevents burner operation if the flue or intake is obstructed, maintaining critical combustion safety protocols.

• Is this switch compatible with 80% efficiency furnaces? No, this dual-stage pressure switch is specifically designed for 90%+ high-efficiency, two-stage condensing furnaces that require multi-level vacuum verification.
• Can I use this to replace a single-stage switch? This part is intended for 2-stage systems with specific 0.55/0.95 W.C. requirements; always match the exact W.C. ratings on your existing switch.
• Why is my furnace tripping on a pressure switch code? Often caused by a failing inducer, a blocked condensate drain, or a restricted vent, but if those check out, the 26W42 pressure switch may have a ruptured diaphragm or fouled contacts.

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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.