Efficiently Verifying the Functionality of Your Furnace’s Pressure Switch- A Comprehensive Guide

How to Check Pressure Switch on Furnace

The pressure switch on a furnace is a crucial component that ensures the safe and efficient operation of the heating system. It plays a vital role in maintaining the correct pressure within the furnace, preventing any potential hazards such as explosions or leaks. Checking the pressure switch regularly is essential to ensure that your furnace is functioning optimally. In this article, we will guide you through the process of how to check pressure switch on furnace.

Understanding the Pressure Switch

Before diving into the inspection process, it’s important to understand the role of the pressure switch. The pressure switch is a safety device that monitors the pressure inside the furnace. It is typically located on the pressure relief valve, which is part of the furnace’s exhaust system. When the pressure inside the furnace exceeds the safe limit, the pressure switch opens the relief valve to release excess pressure, preventing any damage to the furnace or the surrounding area.

Step-by-Step Guide to Checking the Pressure Switch

1.

Turn off the power supply:

Before you begin, ensure that the power supply to the furnace is turned off. This is for your safety and to prevent any electrical hazards.

2.

Locate the pressure switch:

The pressure switch is usually located on the pressure relief valve, which is part of the furnace’s exhaust system. Check the user manual or consult a professional if you are unsure of its location.

3.

Inspect the pressure switch:

Once you have located the pressure switch, examine it for any signs of damage or wear. Look for cracks, corrosion, or loose connections. If you notice any issues, it is advisable to replace the pressure switch.

4.

Check the pressure switch operation:

To test the pressure switch, you can use a multimeter. Set the multimeter to the ohms or resistance setting and touch the probes to the terminals of the pressure switch. If the switch is functioning correctly, the multimeter should show a low resistance value when the switch is closed and a high resistance value when the switch is open.

5.

Listen for the pressure relief valve:

While the power is off, listen for any hissing sounds coming from the pressure relief valve. If you hear a hissing sound, it indicates that the pressure switch is working correctly and releasing excess pressure.

6.

Turn on the power supply:

Once you have completed the inspection, turn the power supply back on and monitor the furnace’s operation for any signs of pressure issues.

Conclusion

Checking the pressure switch on your furnace is an essential maintenance task that can help ensure the safety and efficiency of your heating system. By following the steps outlined in this article, you can inspect and test the pressure switch to ensure it is functioning correctly. If you are unsure about the process or encounter any issues, it is always advisable to consult a professional HVAC technician.