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How To Effectively Test A Hvac Pressure Switch A HVAC pressure switch refers to a protective device which is installed in heating and cooling systems. The switch can open and cause the system to stop working under certain conditions, an element which might hurt the system as a whole. Pressure switches are in most instances tripped by various occurrences like clogged hoses or vents, condenser coils and dirty filters. If you are having issues with your HVAC system, perhaps the pressure switch is not working as desired. That is why you have to troubleshoot the entire system and make sure all things are working as desired.

Here now is a look at how you can test a HVAC pressure switch. You however need to have the right tools for you to effectively execute the job at hand. The most important tools in this case are a digital voltmeter or multimeter. The following guidelines might help you to get things right in this regard:

Terminal Inspection

The first parts that you need to look at when assessing your HVAC pressure switch are the terminals. The terminals on the pressure switch have to be in good form. If you find that some of the terminals are badly discolored or burnt, it might be a good idea to replace the entire switch. Replacing the terminals might help but this will only be a short-lived aspect since they can get burnt easily. The terminals that originally came with the switch are most recommended to use.

Display AC Volts

Secondly, you need to set the multimeter or Voltmeter to display AC volts. This is what will give you an accurate reading on the HVAC system. Clogged vents can cause the entire system to use up more power than is required. It is important to make sure that the switch is working in the right manner. This applies both for heating and cooling systems.

Link Probes to the Terminals


After that, you will have to touch the probes from the meter to one of the terminals of the pressure switch. This is just to make sure that there is a consistent supply of pressure within the system. You can ground the other probe to a nearby metal in order to check if terminals are working in the right manner. The terminals are what determine whether the system is working effectively or not.

What Does The Voltage Reading Show?

Last but not least, you can proceed to check the voltage readings on the meter. If you get a reading of less than 24 volts, the HVAC pressure switch should be open. If the vents, hoses and coils are free of clogs and this is still the reading, then your switch might be faulty. You need to proceed and seek the services of a HVAC repair expert.

There are many HVAC pressure switch repair experts out there today. If you search locally you will be able to come across some of these experts. Again, you have to understand that not all of the experts out there can actually offer you the quality services that you require. That is why you need to take your time when you are doing your research.


How to effectively test a hvac pressure switch