Amana-Goodman B1370133 Pressure Switch

The Amana-Goodman B1370133 Pressure Switch is a critical safety component engineered for Goodman furnace repair and Amana heating systems. This genuine OEM HVAC replacement part features a precise -0.35" WC setpoint, designed to monitor pressure differentials within the combustion chamber. Utilizing a Single Pole Single Throw (SPST) configuration, this switch acts as a failsafe, ensuring the draft inducer motor is moving sufficient air to vent combustion gases safely before allowing the ignition sequence to proceed. Its 1/4" barb connection provides a secure, airtight fit to standard pressure tubing, minimizing the risk of nuisance trips or furnace pressure switch errors in high-efficiency systems.

For veteran technicians, the B1370133 switch is the direct aftermarket furnace air switch alternative to older part numbers like B1370138 and B13701-33. Whether you are troubleshooting a 3-flash diagnostic code on a Goodman gas furnace or performing seasonal maintenance on an Amana air handler, installing this factory-spec component ensures the unit remains within its original safety parameters. The robust construction is built to withstand the rapid cycling and thermal stresses common in residential and light commercial HVAC environments.

Key Benefits for Contractors:

• Direct OEM Fit: Guaranteed compatibility with Goodman, Amana, and Janitrol GMP, GSM, and GSU series furnaces.
• High-Accuracy Sensing: Calibrated to -0.35" WC to ensure precise airflow verification and prevent heat exchanger damage.
• Standardized Installation: Features a universal 1/4" barb fitting and 2-wire terminal layout for fast field replacement.
• Safety Optimized: Critical for resolving furnace not heating issues caused by "open" pressure switch malfunctions.

Common Questions:

What causes a furnace pressure switch to stay open?
An open circuit often indicates a restricted flue vent, a failing inducer motor, or a cracked heat exchanger. Always inspect the 1/4" barb connection and tubing for blockages or moisture before replacing the switch.

Can I use a higher WC rated switch as a substitute?
No. Pressure switches are safety devices calibrated to specific blower and venting requirements. Using a switch with an incorrect setpoint can result in unsafe operation or system lockout.

Is the mounting bracket included?
This specific model is often supplied as the switch assembly; check your existing bracket for compatibility as many Goodman units use a standard mounting footprint for the B1370133.

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.