Rheem-Ruud 42-101443-89 Pressure Switch

The Rheem-Ruud 42-101443-89 Pressure Switch is a critical OEM safety component calibrated at .45" WC (Water Column) for precise combustion monitoring in high-efficiency gas furnaces. As a veteran-grade dual stage pressure switch, this part ensures the inducer motor maintains the required vacuum pressure before allowing the ignition sequence to proceed, preventing hazardous exhaust buildup. This specific furnace air pressure switch is the certified direct replacement for 42-21582-03, engineered to meet exact manufacturer tolerances where generic or adjustable alternatives often fail to provide reliable tripping points. Professionals recognize this Honeywell-manufactured HVAC part by its three-terminal configuration and single-port design, which simplifies integration into existing wiring harnesses while maintaining system integrity. When troubleshooting pressure switch stuck open codes or 4-blink fault sequences on Ruud or Rheem air handlers, using this genuine OEM furnace part is the industry standard for restoring safe, reliable operation in residential units.

• OEM Precision: Factory-calibrated to a .45" WC pressure setting to prevent nuisance trips and ensure exact safety thresholds.
• Direct Compatibility: Serves as the official successor for part numbers 42-101443-09 and 42-21582-03, eliminating fitment guesswork.
• Rugged Construction: Built by Honeywell with a durable plastic housing and high-conductivity terminals for long-term resistance to heat and vibration.
• Safety Compliance: Designed specifically for Rheem and Ruud gas furnaces to signal the control board of proper venting and flue clearance.

How do I verify if the 42-101443-89 pressure switch is faulty?
Technicians should perform a continuity test using a multimeter while the inducer motor is running. If the switch does not close at its rated .45" WC vacuum, or if there is a pressure switch cycle lockout, the internal diaphragm may be ruptured or the contacts pitted.

Can I use an adjustable pressure switch instead of the 42-101443-89?
It is not recommended. This fixed-setpoint pressure switch is calibrated for specific burner configurations. Using an adjustable switch can lead to unsafe combustion levels or inconsistent ignition, potentially damaging the heat exchanger.

What furnace models utilize this specific pressure switch?
The Rheem 42-101443-89 is commonly found in RGVC and UGDC series furnaces, as well as multiple WeatherKing and Corsaire models that require a .45" WC safety interlock.

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.