Rheem-Ruud 42-101225-81 Pressure Switch

The Rheem-Ruud 42-101225-81 Pressure Switch is a critical safety component designed for precise furnace draft monitoring and combustion blower verification. This genuine OEM furnace part features a fixed .35" WC set point, ensuring the system operates only when the induction motor maintains the exact static pressure required for safe venting. As a single pole single throw (SPST) air pressure switch, it acts as a primary fail-safe, preventing ignition if a blocked flue or restricted heat exchanger is detected.

This unit serves as the direct replacement for 42-101225-01 and 42-101468-01, offering a refined response profile for 1/4-inch barb connections. For field technicians, this 0.35" SPST switch is the standard solution for Rheem UGPN series gas furnaces and compatible Ruud air handlers. Built to withstand high-temperature environments near the inducer assembly, this 0.35 inch water column pressure switch ensures reliable contact closure under demanding duty cycles, eliminating nuisance trips often associated with non-OEM alternatives.

• OEM Precision: Calibrated specifically to a .35" WC trip point for exact compatibility with Rheem-Ruud combustion sequences.
• Enhanced Safety: Effectively monitors inducer motor RPM and flue vacuum levels to prevent hazardous exhaust buildup.
• Seamless Retrofit: Engineered as a drop-in replacement for 42-101225-01, utilizing standard slip-on wire terminals and barb fittings.
• Industrial Durability: Robust diaphragm construction resists early fatigue from humidity and thermal fluctuations within the furnace cabinet.

Is the 42-101225-81 compatible with older .30" WC models?
While some legacy documentation mentions .30" WC, the 42-101225-81 is the factory-approved set point update for all specified models requiring this family of switches to ensure modern safety margins.

What are the symptoms of a failing pressure switch?
Technicians typically diagnose this when the inducer motor runs but the igniter fails to glow, often accompanied by diagnostic LED flash codes indicating a pressure switch circuit error or "stuck open" condition.

Can this switch be used in horizontal or vertical furnace orientations?
Yes, this Rheem factory authorized part is designed to operate reliably in multiple mounting positions, provided the vacuum tubing remains clear of moisture traps.

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.