HK06NB020 Dual Pressure Switch: Everything You Need to Know
The HK06NB020 is a critical component in many Carrier, Bryant, and Payne furnace systems. If you’re dealing with furnace issues or looking for a replacement part, understanding this dual pressure switch is essential for maintaining your heating system’s performance and safety. Let’s dive into everything you need to know about the HK06NB020 pressure switch and why it matters for your furnace.
What Exactly is the HK06NB020 Dual Pressure Switch?
The HK06NB020 is a factory-designed dual pressure switch assembly specifically engineered for select Carrier, Bryant, and Payne furnace models. This component serves as a safety mechanism that monitors two critical pressure points in your furnace:
- High Pressure Side (HPS): Monitors the inducer housing at 0.30″ Water Column (WC)
- Low Pressure Side (LPS): Monitors the collector box at 0.75″ Water Column (WC)
With a normally open circuit design, this switch helps ensure your furnace operates only under safe pressure conditions, preventing potential hazards and maintaining efficient performance.
HK06NB020 Technical Specifications
Understanding the specifications of the HK06NB020 helps ensure you’re getting the right part for your system:
- Dimensions: 2.4″ Length × 2″ Height × 4.2″ Width
- Weight: Approximately 0.01 lbs
- Manufacturer: Carrier
- Circuit Type: Normally Open
- Pressure Ratings: HPS 0.30″ WC, LPS 0.75″ WC
Why the HK06NB020 Has Been Discontinued
If you’ve been searching for the HK06NB020, you might have noticed it’s increasingly difficult to find. That’s because this part has been officially discontinued by Carrier and replaced with the upgraded HK06MB020 model. The newer model maintains compatibility with the same furnace systems while incorporating design improvements.
For those still looking for the original part, some suppliers may still have limited stock available, though availability is quickly diminishing.
HK06MB020: The Official Replacement for HK06NB020
The HK06MB020 is the direct, factory-authorized replacement for the HK06NB020. If you’re in need of a replacement, this is the part recommended by Carrier. It offers:
- Direct drop-in compatibility with all systems that used HK06NB020
- Same pressure ratings and functionality
- Improved design based on performance data from the original model
- Full warranty coverage when installed by a qualified technician
Compatible Furnace Models with HK06NB020
The HK06NB020 dual pressure switch is designed to work with specific furnace models across the Carrier, Bryant, and Payne product lines. Below is a partial list of compatible models:
Carrier Compatible Models
- 59TN6A080V211120
- 59TP5A080E171116
- 59TP6A080E171216
- 986TA48080V17
- PG92SAS48080BAAA
Bryant Compatible Models
- 912SB36060S14
- 922SA48080V21
- 925SA48080E17A-A
Payne Compatible Models
- PG92ESAA30040AAA
- PG92SBS30040AAAA
This is not an exhaustive list. Your specific model may be compatible even if not listed above. When in doubt, consult your furnace documentation or contact an HVAC professional.
Common Issues with the HK06NB020 Pressure Switch
The HK06NB020 dual pressure switch can sometimes experience problems that affect your furnace’s performance. Understanding these issues can help you diagnose problems more effectively:
1. Pressure Switch Stuck Open
When the switch fails to close properly, your furnace may fail to initiate or complete its ignition sequence. This is often indicated by blinking error codes on your furnace control board. Common causes include:
- Blockages in pressure tubing
- Water in the collector box
- Failed inducer motor not creating sufficient pressure
- Internal switch failure
2. Pressure Switch Stuck Closed
Though less common with the HK06NB020, a switch that remains closed when it should be open can create unsafe operating conditions. Your furnace’s safety systems will typically prevent operation when this occurs.
3. Intermittent Operation
The switch may work properly sometimes but fail at others, leading to unreliable furnace performance. This is often due to:
- Partially blocked venting
- Condensation in pressure tubes
- Weakening internal components in the switch
How to Replace the HK06NB020 Dual Pressure Switch
Replacing the HK06NB020 or installing its replacement requires careful attention to detail. While we recommend professional installation for warranty purposes, here’s an overview of the process:
Safety First
Before beginning any work:
- Turn off power to the furnace at the breaker
- Shut off the gas supply
- Allow the furnace to cool completely if it’s been running
Replacement Steps
- Remove the furnace access panel to locate the existing pressure switch
- Take a photo or make note of how the pressure tubes are connected
- Carefully disconnect the electrical connectors from the switch
- Remove the pressure tubes, noting which connects to which port
- Unscrew or unclip the switch from its mounting bracket
- Install the new switch in the same position
- Reconnect the pressure tubes to their correct ports
- Reconnect the electrical connectors
- Replace the furnace access panel
- Restore power and gas supply
- Test the furnace through a complete heating cycle
Click here to order your replacement pressure switch if you need the original part or its direct replacement.
Frequently Asked Questions About the HK06NB020
How can I tell if my HK06NB020 pressure switch is bad?
Common signs of a failing HK06NB020 include:
- Furnace fails to ignite
- Furnace starts the ignition sequence but shuts down before heating
- Blinking error codes on your furnace control board (often 2-3 flashes)
- Unusual noises from the inducer motor as it struggles against resistance
Can I test the HK06NB020 switch myself?
Testing the HK06NB020 requires specialized equipment to measure precise pressure differentials. While some technicians may attempt to bypass the switch temporarily for diagnostic purposes, this is not recommended as it bypasses important safety features. Professional testing with a manometer is the safest approach.
Is the HK06MB020 exactly the same as the HK06NB020?
The HK06MB020 is functionally equivalent to the HK06NB020 and designed as its direct replacement. It maintains the same pressure settings and electrical characteristics but may have minor design improvements. All furnaces that used the original HK06NB020 can safely use the HK06MB020 replacement.
How long should a HK06NB020 pressure switch last?
With proper maintenance, the HK06NB020 typically lasts 5-10 years. However, environmental factors such as humidity, dust conditions, and frequency of use can impact its lifespan. Regular furnace maintenance can help extend the life of all components, including the pressure switch.
Why Choose an OEM Replacement for Your HK06NB020
When replacing your HK06NB020 dual pressure switch, using the factory-authorized replacement part offers several advantages:
- Exact specifications matched to your furnace’s requirements
- Preservation of manufacturer warranty on your heating system
- Consistent quality control and testing
- Proper safety certification
While aftermarket alternatives may be available at lower prices, they may not match the precise pressure settings required for your system’s safe operation.
Get your genuine replacement for the HK06NB020 here to ensure your furnace operates safely and efficiently.
Conclusion: Making the Right Choice for Your HK06NB020 Needs
The HK06NB020 dual pressure switch plays a vital role in your furnace’s operation and safety systems. While this specific part has been discontinued, understanding its function and knowing about its direct replacement helps ensure your heating system continues to operate properly.
Whether you’re a homeowner diagnosing an issue or an HVAC professional looking for the right replacement part, choosing factory-authorized components like the HK06MB020 gives you peace of mind that your furnace will operate safely and efficiently for years to come.
Remember that proper installation and regular maintenance are key to maximizing the lifespan of components like the HK06NB020, helping you avoid unexpected heating system failures during the coldest months of the year.