Discovering that your radon mitigation system might not be working can be alarming—but before you panic, take a deep breath. Many radon system problems are simple to identify and even easier to fix. In fact, with a little troubleshooting, you might restore your system’s function without calling in a professional.

This guide walks you through common radon system issues, how to spot them early, and easy fixes you can safely try yourself before reaching for the phone or your wallet.

Why It’s Important to Keep Your Radon System Running Properly

A radon mitigation system protects your home from radon gas, a naturally occurring radioactive gas that can seep through foundation cracks. Prolonged exposure can lead to serious health risks, including lung cancer.

When your system malfunctions, radon can build up quickly—often without visible or noticeable signs. That’s why routine maintenance and quick action are essential.

1. Check the Manometer—Your First Line of Defense

Every radon mitigation system includes a small U-shaped tube called a manometer. This simple device shows whether the fan is pulling air through the system properly.

How to check:

• Look at the two colored liquid levels in the tube.

• If the levels are uneven, your fan is working.

• If the levels are even, your fan may not be running.

✅ Easy Fix:
Make sure the fan is plugged in and that power hasn’t been interrupted. Sometimes, a tripped breaker or unplugged cord is all it takes to shut the system down.

2. Ensure the Fan Has Power

A silent fan doesn’t always mean it’s broken—it might just be off.

How to check:

• Verify that the outlet has power by plugging in another device, like a lamp.

• If there’s no power, check the breaker box for tripped circuits.

• If you find a tripped switch, flip it back on.

✅ Easy Fix:
Reset the breaker, check all connections, and ensure no cords are frayed or loose. If your outlet works and the fan still won’t run, the fan motor may be worn out.

3. Listen for Unusual Fan Noises

Your radon fan should hum quietly and consistently. Strange sounds like rattling, squeaking, or grinding often indicate a mechanical problem.

✅ Easy Fix:
Turn the system off, inspect the fan housing, and ensure no debris, insects, or water are inside. If you spot buildup, clear it gently. Restart the fan and listen again.
If noise persists, the bearings or motor may be failing—time to call a radon technician.

4. Check for Condensation or Water in the Pipes

Moisture is a common cause of system inefficiency. Condensation buildup can block airflow and reduce suction power, especially during cold or humid weather.

Signs to look for:

• Water dripping from joints

• Gurgling sounds in pipes

• Ice forming on exterior vent pipes in winter

✅ Easy Fix:

• Wrap pipes in insulation to prevent condensation.

• Check for proper pipe slope—the vent should tilt slightly away from the house to let water drain out.

• If you find standing water inside the pipe, contact a professional to clear it safely.

5. Inspect for Loose or Damaged Pipes

Over time, vibration from the fan or temperature changes can cause pipes to shift or crack. When that happens, radon gas may leak back into your home instead of venting outside.

✅ Easy Fix:
Walk along the entire pipe run—from the suction point in your basement to the exterior vent—and check for:

• Cracks or separations in PVC joints

• Loose brackets or straps

• Disconnected elbows or fittings

If you spot a gap, seal it temporarily with radon-safe silicone caulk or PVC cement until a technician can inspect it properly.

6. Retest Your Radon Levels

Even if everything looks fine, your radon levels might have changed. Testing is the only way to confirm your system’s effectiveness.

✅ Easy Fix:
Purchase a short-term radon test kit (available at most hardware stores or online).

• Place it in the lowest livable area of your home.

• Leave it for 2–7 days as directed.

• Mail it in or use the digital reader to get results.

If readings are above 4.0 pCi/L, your system isn’t reducing radon effectively—and professional assessment is recommended.

7. Examine Exterior Vent Outlets

Outside your home, the vent pipe releases radon gas safely above your roofline or wall. However, debris, nests, or snow buildup can block airflow.

✅ Easy Fix:

• Inspect the vent outlet for obstructions.

• Clear away leaves, bird nests, cobwebs, or ice.

• Ensure the outlet is at least 12 inches above the roofline and unobstructed.

Keeping this vent clear helps the system maintain proper suction and prevents backflow.

8. Review the System’s Age

Like any mechanical device, radon fans wear out over time. The average lifespan is 5 to 10 years.

✅ Easy Fix:
Check your installation date—if your fan is older than 8 years, consider proactive replacement. A new fan is quieter, more energy-efficient, and helps maintain consistent performance.

9. Test for Air Leaks Around the Foundation

Even if the system is running, radon can still enter your home if new cracks or gaps have formed in the foundation.

✅ Easy Fix:
Walk around your basement or crawl space and inspect:

• Floor cracks

• Sump pump covers

• Pipe penetrations
  Seal small openings with urethane caulk or polyurethane sealant to minimize entry points.

10. Monitor Regularly to Prevent Future Problems

Once your system is running smoothly again, keep it that way with simple, ongoing care.

✅ Easy Maintenance Tips:

• Check your manometer monthly.

• Listen for fan noise or vibration.

• Keep vents free of obstructions.

• Retest radon levels annually.

• Record system readings so you can spot changes early.

These habits take only minutes but ensure long-term safety and peace of mind.

When DIY Fixes Aren’t Enough

If your fan still won’t run, radon levels remain high, or you suspect a serious leak, it’s time to call a certified radon mitigation professional.
They have the tools to:

• Diagnose electrical or suction issues

• Replace fans safely

• Verify airflow and pressure

• Conduct post-repair radon testing

A small service visit today can save you from high radon exposure tomorrow.

Estimated Costs for Professional Repairs

If your quick fixes don’t solve the issue, here’s what you can expect to pay for expert help:

Remember: investing in proper maintenance is cheaper and safer than dealing with long-term radon exposure.

Conclusion: Stay Calm, Stay Safe

A radon system malfunction can be stressful, but in most cases, the solution is simple. From checking your manometer and power supply to clearing vents or sealing cracks, these small steps often restore your system’s performance fast.

However, don’t skip regular radon testing—it’s the only way to ensure your home’s air remains safe. When in doubt, always call a qualified radon professional like Colorado Springs Radon Mitigation for expert inspection, repair, and testing services.

With a little vigilance and routine care, you can protect your family’s health, avoid unnecessary repairs, and breathe easy knowing your radon system is doing its job.