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How Do I Know When to Replace an Air Pressure Sensor Switch

How Do I Know When to Replace an Air Pressure Sensor Switch

, by Thrive Agency, 4 min reading time

For optimal performance, home and commercial air conditioning systems use an air pressure sensor switch. Inconsistencies in your AC’s airflow or frequent cycling could indicate that this component requires inspection or replacement.

This guide covers the function of an air pressure sensor switch. Below, we’ll cover when to replace this component, the differences in wear for home vs. commercial units, and the benefits of regular maintenance.

What is an Air Pressure Sensor Switch?

The air pressure sensor switch on your HVAC monitors the pressure levels within the entire system. It ensures that your entire system operates within safe and efficient parameters. When the sensor detects abnormal pressure, it signals the system to adjust or shut down to prevent damage.

Symptoms That an Air Pressure Switch Needs Replacement

1. Inconsistent Airflow

This is one of the most common signs to look out for. In residential HVAC units, this often manifests as noticeable drops in airflow or uneven cooling throughout the house despite the thermostat settings remaining unchanged.

Inconsistent airflow can have an even more severe impact on commercial units. Commercial HVAC systems are designed to manage larger areas and multiple zones. When airflow becomes inconsistent, it can affect entire floors or sections of a building.

2. Frequent Cycling

Homeowners may notice their HVAC system turning on and off more frequently than usual. It can wear out the air conditioning components faster, leading to inefficient energy use, which can spike your utility bills.

Commercial units experience even more significant challenges with frequent cycling. This can cause the system to overheat, resulting in more frequent breakdowns and costly repairs.

3. Unusual Noises

Unusual noises from your air conditioning system indicate something is wrong with your unit. You may hear whistling or hissing noises, which are warning signs that the system is struggling to maintain proper pressure levels. Noises such as clanging or banging can be even louder in commercial units. These symptoms require immediate attention.

4. Error Codes

Modern air conditioning systems come equipped with diagnostic capabilities. They display error codes when something goes wrong, which allows you to determine the faulty component, helping a technician pinpoint the exact problem.

5. Increased Energy Bills

A gradual increase in energy costs is another sign that your air pressure sensor switch may need replacement. An inefficient system will work harder to maintain the desired temperature, leading to higher utility bills. This can occur despite consistent usage in your home or office.

6. Warm Air from AC Unit

When the sensor switch is faulty, your HVAC can stay on even if it is scheduled to be turned off, or vice versa. This malfunction can result in heat buildup, which causes your AC to blow warm air.

Wear and Tear: Home vs. Commercial Units

Home units typically experience less intense usage but can still suffer from wear and tear over time. You can expect your air pressure switch at home to last longer than those installed in the office or commercial space.

Environmental factors and regular household activities can contribute to the gradual degradation of the air pressure switch. Conversely, commercial units have more rigorous and continuous usage, which can cause components to depreciate faster. Larger systems and higher operational demands tend to accelerate wear and tear, necessitating more frequent inspections and maintenance.

Benefits of Regular Maintenance

Regular maintenance is a necessity for all types of HVAC systems. The air pressure sensor switch requires regular checkups, to ensure it is working optimally:

Here are some of the benefits of regular sensor and HVAC maintenance:

  • Extended Lifespan: Regular checks and timely replacements prevent system breakdowns.
  • Energy Efficiency: Well-maintained systems operate more efficiently, reducing energy consumption.
  • Cost Savings: Prevents costly repairs and reduces energy bills.
  • Optimal Performance: Ensures consistent and reliable cooling performance.

Check Out Value Controls for Top of the Line Air Pressure Switches

Identifying any of the signs mentioned above may indicate that the air pressure sensor switch is faulty. For durable and compatible replacement parts, check out Value Controls' inventory.

Value Controls is committed to providing our customers with the best components. We are a trusted supplier of quality HVAC parts, offering the best value at the lowest cost.

Our inventory includes certified pre-owned HVAC controls, including air pressure sensor switches from the best-known brands. We stand behind every product we supply to our clients, providing a reliable 2-year warranty on all orders shipped the same day when placed by 3 p.m. CST.


At Value Controls, we stock various air pressure switch units from different brands. Contact us today to determine which unit best suits your premises.


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