Rheem-Ruud 42-24166-81 Pressure Switch

For veteran HVAC technicians and service contractors, the Rheem-Ruud 42-24166-81 Pressure Switch is the definitive OEM replacement for maintaining the safety loop in two-stage gas furnaces. This dual pressure switch assembly is factory-calibrated with precise setpoints of -0.15" WC for low-fire and -0.30" WC for high-fire operations, ensuring the inducer motor maintains the necessary static pressure for safe flue gas venting. Designed specifically for Rheem RGLK and RGPK models, as well as several Ruud and Weather King equivalents, this component replaces legacy part numbers 42-24166-71 and 42-24166-11.

The 42-24166-81 switch features self-cleaning snap-action contacts to prevent carbon buildup and nuisance trips in high-temperature air-proving applications. With its robust plastic housing and reliable diaphragm construction, it facilitates stable switching performance across an operating range of -40°F to 190°F. When troubleshooting Rheem furnace pressure switch faults, using this genuine ProTech OEM part ensures exact electrical and vacuum port alignment, eliminating the safety risks associated with "universal" adjustables that often fail to meet the delicate tolerances required for high-efficiency condensing furnaces.

• Dual-Stage Calibration: Integrated low (-0.15" WC) and high (-0.30" WC) setpoints specifically tuned for 2-stage heating cycles.
• OEM Compatibility: Drop-in replacement for RGLK, RGPK, UGLK, and UGPK furnace series, ensuring physical and technical alignment.
• Enhanced Reliability: Equipped with self-cleaning contacts to reduce service calls caused by intermittent connectivity.
• Complete Installation Kit: Typically includes necessary wire leads and nylon ties to streamline the swap-out process.

• Can I adjust the WC settings on this switch? No, these are factory-set points. Field adjustments are not recommended as they can compromise system safety and lead to improper combustion.
• How do I know if the switch is failing? If your furnace displays a code for 'pressure switch stuck open/closed' and you’ve verified the inducer and venting are clear, use a manometer to confirm if the vacuum matches the -0.15" or -0.30" requirements.
• Is this compatible with 80% and 90% AFUE units? Yes, this dual switch is found in various 80% through 95% AFUE 2-stage models depending on the specific venting configuration.

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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.