Common Radon Fan Problems and How To Avoid Them

You’ve taken the responsible step of testing your home for radon by installing a mitigation system. But now, you’re dealing with issues like noisy fans, rising utility bills, or even radon levels creeping back up. A radon fan is the heart of your system, running 24/7 to vent harmful gases safely, but like any continuously running device, it can encounter issues. Keep reading to understand the common radon fan problems and how to avoid them.

Common Radon Fan Problems

Radon mitigation system fans are generally reliable and can last for eight years or more. However, when they fail, it’ll typically become noticeable in the following ways:

Bearing Noise

This is the number one reason homeowners replace their radon fans. Because these fans run continuously, the motor’s bearings are under constant stress. Over time, the lubricant can dry out or degrade.

When the bearings start to go, you won’t have to guess. It usually manifests as a loud, high-pitched whirring or grinding noise that begins suddenly and just doesn’t stop. This is the sound of metal-on-metal friction, and unfortunately, it’s a one-way street. Once the bearings are shot, it means your fan has reached the end of its useful life, and you should replace it promptly.

Fan Failure (Won’t Turn On)

Sometimes, the problem isn’t noise—it’s silence. If your fan isn’t running at all, check your manometer (that U-shaped tube on the pipe). If the fluid levels are at zero, there is no vacuum pressure, meaning the fan is off.

Several things can cause this. It could be a simple tripped breaker or a power outage that didn’t reset correctly. Typically, it’s simply “end of life.” Like a light bulb or a car battery, these fans eventually wear out.   Read more about replacement here.

This is why a radon system alarm is so important. Read more about these alarms here.

Reduced Airflow

You might notice the fan is running, but it’s not moving as much air as it used to. This can be tricky to spot without a pressure gauge, but a manometer reading that has risen significantly. This is rarely the fan’s fault directly, and the issue is typically a clog of some sort.

On the suction side (under the slab), construction debris, dirt, or gravel might have shifted and blocked the pipe. On the exhaust side (above the roof), you might have unwanted tenants. Since the air coming from the ground is relatively warm, critters love to build nests in the exhaust pipe during colder months.

Lastly, precipitation could be the cause. A rising water table or ice in your system will inhibit airflow.

Improper Installation Leading to Water Damage

Water is the enemy of electronics, and radon mitigation fans are no exception. Radon gas isn’t dry; it comes from soil that is full of moisture. Your fan is essentially moving damp air all day, every day.

If the fan is “sideways” (horizontally) rather than plumb (vertically), condensation can pool inside the housing. Instead of draining back down into the ground as it should, that water sits there, turning your fan into a water pump. This will short out the motor in days or weeks, and it always voids the manufacturer’s warranty.

Preventing Radon Fan Problems

Now that we understand the common radon fan problems, how do we avoid them? While you can’t make a mechanical device last forever, you can certainly extend its service life and ensure it operates efficiently while it’s in use.

Install It Upright (Plumb)

We cannot stress this enough: gravity is your friend. You must install your radon fan vertically. This allows the condensation that naturally forms inside the system to drain back down the pipe and into the soil, keeping the motor dry. If you are DIYing this, make sure you use a level. Consider installing a condensation bypass like our hydro 2.0 or sleek transition to help remove condensation from your system entirely.

Keep It Running

You might think, “I’ll save electricity and wear-and-tear by turning it off when I’m on vacation.” Do not do this. Radon mitigation systems operate continuously. The bearings are self-lubricating and rely on continuous rotation to stay greased.

When you stop the fan, the moisture inside the system settles into those bearings. When you start it up again, that moisture causes damage. Turning your fan on and off is the fastest way to kill it. Let it run.

Professional Sizing

Bigger isn’t always better. If you have sandy soil, you need a different fan than if you have dense clay. Installing a massive, high-wattage fan on a house that doesn’t need it is a waste of electricity and money. It also puts a much noisier fan on your home for no reason at all. Conversely, putting a weak fan on a large footprint or tight soil increase noise and not mitigate radon effectively. Consult a professional or use diagnostic tools, such as a pressure field extension test, to determine exactly how much suction and airflow your home requires.

Guard Against Debris and Animals

To prevent the “critter clog,” install a critter guard on the exhaust pipe. A PDS Bird Barrier is a simple, inexpensive fix that keeps birds and squirrels out of your system while allowing air to vent freely. It’s a small investment that protects the entire system.

The Golden Rule: Annual Testing & Airflow Alarms

You can perfectly install the best fan in the world, but you won’t know if it’s actually working unless you test it regularly. The EPA recommends testing your home for radon every two years, but if you have an active mitigation system, we recommend testing annually.

Mechanical things break, soil conditions change, and cracks in the foundation settle. An annual test is your report card. It tells you whether the fan is still doing its job or the bearings are starting to drag enough to affect performance.

Be sure you use a KTA 2.0 radon alarm system or an aftermarket alarm to alert you to system changes that need inspection. At PDS, we recommend the Obar alarm line for most systems.

Choosing the Right Radon Fan

If your current fan is screaming at you and it’s time for a replacement, don’t just buy the first thing you see on a random internet marketplace. Key considerations when choosing a radon mitigation fan for your home include energy efficiency, location, and housing material.

Energy Efficiency Matters

Since this appliance runs 24/7/365, wattage counts. A fan that draws 80 watts versus one that draws 40 watts will make a noticeable difference on your electric bill over the course of a year. Look for modern, energy-efficient models. Fantech fans, specifically the Rn EC series, offer superior performance at lower power consumption.

Location, Location, Location

Remember that you should only install radon mitigation systems in three places:

• Outside the home
• In the attic
• In an unfinished garage with no living space above it

Never install a radon fan in your basement or crawlspace. If a leak were to develop in the fan housing or the pipe above the fan, you would be pumping concentrated radon gas directly into your living space.

Housing Material

Cheap plastic cracks, metal rusts. When selecting a fan, look for UV-resistant, heavy-duty plastic housing. For example, RadonAway’s ProSeries fans feature an “EverWhite” housing that resists the elements without yellowing or becoming brittle over time. A robust housing helps the fan survive harsh winters and scorching summers.

Resolve Your Radon Fan Problems with PDS Radon Supply

Maintaining your radon fan is about much more than stopping a nuisance noise—it’s about keeping the air your family breathes safe and clean. Whether your fan is screeching for help or has gone silent after years of service, remember that a functional system is your only real defense against soil gas. If you’re ready to upgrade to a more efficient, reliable model, visit PDS Radon Supply to find the perfect fan for your home.