Rheem-Ruud 42-101447-02 Pressure Switch

The Rheem-Ruud 42-101447-02 Pressure Switch is an essential safety component designed to verify proper draft and venting within high-efficiency gas furnaces. Built to monitor negative pressure produced by the induced draft blower, this OEM Rheem furnace part triggers at a precise 1.55" WC (Water Column) set point. For technicians troubleshooting a pressure switch open error code, this replacement ensures the signal to the ignition control is restored only when the combustion air system is venting safely.

Constructed for professional-grade reliability, the 42-101447-02 features a rugged diaphragm and a compact housing that integrates seamlessly into existing mounts. This negative pressure switch provides the critical safety feedback required to authorize the ignition sequence, preventing the buildup of dangerous flue gases. When performing maintenance or repairs on Rheem or Ruud HVAC equipment, using this HVAC pressure switch ensures factory-spec airflow monitoring and long-term system stability.

• Precise Calibration: Factory-set at 1.55" WC to match OEM airflow requirements for specific furnace models.
• Enhanced Safety: Acts as a critical lockout mechanism to prevent furnace operation during vent blockages or blower failure.
• Direct Fit: Designed as an authentic Rheem replacement part, eliminating the need for field modifications or generic adapters.
• Industrial Durability: Resists moisture and high-heat environments common in furnace blower compartments.

What causes a furnace pressure switch to stay open?
Technicians should check for blocked vent pipes, cracked pressure tubing, or a failing inducer motor. If the motor isn't reaching RPMs or the flue is restricted, the switch won't reach its 1.55" WC threshold.

Can I use a universal switch instead of the 42-101447-02?
In technical HVAC applications, using a switch with the exact water column rating is mandatory. A universal switch with the wrong set point can lead to unsafe operation or frequent nuisance tripping.

How do I test the 42-101447-02 during a service call?
Use a digital manometer to measure the actual draft produced by the inducer. If the negative pressure exceeds 1.55" WC but the switch remains electrically open, the internal diaphragm or contacts have likely failed.

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.