How to Find and Fix a Pressure Switch Error on Your Furnace

Do you know how your furnace operates? Understanding the inner workings of your home’s heating system and being able to troubleshoot problems when they arise is important. At some point, you might encounter issues with your furnace pressure switch. A pressure switch error on your furnace could mean a variety of things, but it’s almost always an indication that something isn’t right. Fixing this problem as soon as possible will protect you from potential danger and extend the life of your heater. A pressure switch detects changes in air pressure and sends those readings to the rest of the system so it can adjust accordingly. In most cases, a pressure switch error on your furnace is a sign that there’s something off with the pressure coming into the house and that a solution needs to be found quickly. The good news is that most pressure switch errors are relatively easy to diagnose and even easier to fix. Here are some common signs that you have a pressure switch error on your furnace, along with advice on how to fix it.

Your Furnace is Constantly Beeping

If you hear a constant beeping noise coming from your furnace when it’s running, it might be an indication of a pressure switch error. A pressure switch is designed to send a signal to the rest of the system when the pressure coming into the house changes. If that pressure changes often, the pressure switch could be faulty and cause the beeping noise. The main cause of frequent changes in pressure is a leak or clog in the outside vent system. If the pressure coming into your house is too low, the system will compensate by increasing pressure. This causes the pressure to switch to trip, beep, and send a warning to the furnace.

You Hear a Continual Humming Noise When the Furnace is Running

In addition to a pressure switch error, a continual humming noise could also be an indicator that there is an issue with the pressure of the air inside your home. If the outside pressure is too high, the system will compensate by reducing pressure and increasing the flow of air inside the house. This causes the furnace to hum as it works to bring the pressure back up to normal levels. If the pressure is too high, it could indicate that something is clogging your outdoor vent or that the outside weather is too cold. If the pressure is too low, it could indicate a leak in your vent or that the outside weather is too warm. Once again, these issues must be fixed as soon as possible to avoid safety hazards and extend the life of your furnace.

The Furnace Does Not Turn On or Stops Working After a Short Time

If your furnace does not turn on when you start up your heat for the day, the furnace pressure switch is most likely the culprit. When the pressure in the house changes, the switch activates the furnace by sending a signal to the control board. Once again, this could be due to a leak in the outside vent or a clog in the air filter. Once you determine that the pressure switch is the problem, you can troubleshoot to determine the root cause. In many cases, you can solve the problem by cleaning out the air filter and/or checking to see if there is a clog in your vent.

Condensation Forms on the Evaporator Coil

A pressure switch error could also cause condensation to form on the evaporator coil. This is a sign that the system is working too hard to compensate for a fault in the house. We mentioned before that a pressure switch error could be due to a leaky vent or a clogged filter, and that is exactly what causes this issue. If there is a leak in the vent or clog in the air filter, the system will compensate by increasing the airflow into the house. This causes the system to work harder, which causes the evaporator coil to form condensation.

You Smell Gas While the Furnace is Running

Finally, you should be on the lookout for a pressure switch error if you smell gas while the furnace is running. The pressure in the house is what powers the gas furnace by pushing it into the burners. If the pressure is too low, it means that there is not enough air coming into the house. If there is a leak in the vent or a clog in the air filter, the system will compensate by increasing airflow into the home. This causes the furnace to work harder, which means it will produce more heat and more gas. This could result in a dangerous buildup of gas inside your home, so you should be on the lookout for this issue and take care of the problem as soon as possible.

Conclusion

The main cause of pressure switch errors is a faulty pressure switch. Other issues could be to blame, but the most common solution is to replace the pressure switch. Before you do, though, you’ll need to determine what kind of pressure switch you have and buy the correct replacement. If you’re not sure what kind of pressure switch you have, you can use the information in this article to determine what you’re dealing with. Then, all you need to do is order the correct part and install it.