Reznor 204328 Pressure Switch

Repairing a unit heater requires precise safety components, and the Reznor 204328 Pressure Switch serves as a critical OEM replacement for maintaining the sequence of operation. This SPDT pressure switch is engineered to monitor differential pressure within the combustion air assembly or venting system, ensuring the inducer motor establishes a proper draft before allowing the ignition cycle to commence. Featuring a standard 1/4" barb connection, it integrates seamlessly with existing silicone or aluminum sensing lines. As a genuine Reznor HVAC part, the 204328 provides the exact set-point calibration needed to prevent dangerous flue gas recirculation or short cycling caused by fluctuating air pressure. Whether you are servicing Reznor unit heaters or commercial duct furnaces, this air pressure sensing switch ensures the control board receives the necessary signal to stay in a safe heating state. Built for durability in high-demand environments, it replaces worn or sticking diaphragms to restore HVAC safety switch reliability and system efficiency.

• Direct OEM Compatibility: Verified Reznor 204328 replacement ensures a perfect fit for combustion air pressure monitoring without the need for field modifications.
• SPDT Logic: Single Pole Double Throw (SPDT) configuration allows for versatile electrical integration across various Reznor unit heater control circuits.
• Secure Pneumatic Interface: The 1/4" barb connection provides a tight seal for sensing tubes, essential for accurate differential pressure readings and system safety.
• Enhanced Safety Monitoring: Prevents furnace operation during vent blockages, inducer failures, or restricted airflow to protect HVAC equipment and occupants.
• Rugged Performance: Designed by Nortek Global HVAC to withstand the thermal cycling and vibration common in industrial heating applications.

Common Questions

How do I troubleshoot a Reznor 204328 switch that won't close?
First, verify that the inducer motor is reaching full speed and the 1/4" barb connection lines are clear of condensate or debris. Use a manometer to check if the induced draft meets the specific pressure switch set point required by your model. If the vacuum is sufficient but the SPDT switch remains open, the internal diaphragm or electrical contacts may be fouled.

Can I use an aftermarket pressure switch instead of the Reznor 204328?
Using a genuine OEM replacement is highly recommended. Set points for Reznor combustion air pressure switches are factory-calibrated to specific "water column inches. An incorrect set point can lead to short cycling or, more critically, allowing the burners to fire without adequate venting.

What are the symptoms of a failing air pressure sensing switch?
The most frequent sign is a Reznor heater that starts its inducer motor but fails to glow the igniter or open the gas valve. You may also see fault codes on the control board indicating a "pressure switch stuck open" or "stuck closed" error, often resulting in a complete system lockout.

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.