Rheem-Ruud 42-101233-81 Pressure Switch

The Rheem-Ruud 42-101233-81 Pressure Switch is a critical safety component designed for precise furnace draft monitoring and combustion blower verification. This genuine OEM furnace part is factory-calibrated to a 0.35" WC (water column) setpoint, ensuring the inducer motor maintains the necessary static pressure to vent flue gases safely. Featuring a Single Pole Single Throw (SPST) configuration and 1/4" barbed connections, this switch provides a reliable interface for modern HVAC safety controls while preventing hazardous operation during venting obstructions.

For service technicians, this switch serves as a direct drop-in replacement for legacy part numbers 42-24335-02 and 42-101233-01. The non-adjustable calibration is specifically engineered to protect high-efficiency gas furnace internal components by interrupting the ignition sequence if proper airflow is not detected. This kit typically includes a replacement air pressure switch, silicone tubing, and necessary wiring harnesses to facilitate rapid field repairs on Protech and Weather King equipment.

• OEM Precision: Factory-set at 0.35" WC to ensure exact safety compliance without the need for field calibration.
• Enhanced Compatibility: Replaces multiple legacy part numbers including 42-24335-02 and 42-101233-01.
• Durable Construction: Features high-grade electrical contacts and a resilient diaphragm designed for high-cycle reliability in demanding heating environments.
• Seamless Integration: Standard 1/4" barbed connection and SPST logic allow for immediate connection to existing HVAC vacuum lines and control boards.

What was the previous part number for this switch?
This unit is the authorized replacement for the 42-24335-02 and 42-101233-01 pressure switches commonly found in older Rheem and Ruud furnaces.

Can I adjust the setpoint on this switch?
No, this is a fixed-setpoint safety device. Adjusting or bypassing a pressure switch can lead to unsafe combustion conditions; always replace with the exact OEM specification.

Inducer motor is running but the switch isn't closing. Is the switch bad?
While the switch may be faulty, first verify the integrity of the silicone rubber tubing, the cleanliness of the inducer port, and that the flue is free of obstructions.

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.