Radon System Repair & Fan Replacement in Huntsville, AL

Radon systems are simple, but they aren't permanent. Fans run 24 hours a day, every day, and eventually wear out. Pipes get bumped, manometers get knocked loose, and sometimes the company that installed the system closes. A Huntsville homeowner described exactly that on r/HuntsvilleAlabama in November 2025: the installer had closed and vanished, and they spent more than a week calling around before finding someone willing to fix it. This page covers how to tell whether your system is working, the common failures and what a repair involves. We're a free referral service, not a contractor. If you need a repair, we connect you with an independent, certified local professional.

How to tell if your system is working

Check the manometer

Most systems have a manometer, a small U-shaped tube with colored liquid, mounted on the pipe. When the fan is pulling suction, the liquid sits higher on one side than the other, and installers often mark the starting level. If the two sides are even, at zero, the system isn't pulling suction, usually because the fan has stopped or the pipe is disconnected. Some newer systems have an electronic alarm instead of, or as well as, a manometer.

Listen for the fan

A working fan makes a low, steady hum. Silence can mean a tripped breaker or GFCI, an unplugged cord or a dead motor. A grinding, rattling or high-pitched sound usually means worn bearings.

Test the air

The EPA recommends retesting a mitigated home every two years to make sure the system is still working, and after major renovations. A continuous monitor makes this easy, since a sudden climb in readings is often the first sign a fan has failed.

Want a certified pro to look at your home?Free, no-obligation call. We connect you with an independent Huntsville-area radon specialist.

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Common problems

Fan failure

This is the most common repair. Fans are sealed units that get replaced, not rebuilt. Many manufacturers warrant their fans for several years, so check your installer's paperwork for the model and warranty dates. A failed fan is usually replaced with the same or an equivalent model so the suction matches the original design.

Tripped breaker or GFCI

Before calling anyone, check the outlet or switch the fan is on and reset the GFCI or breaker. Thunderstorms trip outdoor GFCIs regularly in north Alabama. If it trips again right away, there may be water in the fan or the wiring, and that needs a professional.

Condensation and water noise

Soil gas is humid, and Huntsville's climate adds to that. Water that condenses in the pipe should drain back down to the slab. A gurgling sound or water dripping at a joint can mean a pipe sloped the wrong way or a sagging section, which is a fixable installation detail.

Disconnected or cracked pipe

A pipe knocked loose in the garage or attic, or a rubber coupling that has split, lets the fan pull air from the house instead of from under the slab. The manometer may still show some suction while radon levels climb.

Ice and blockages

On the coldest nights, ice can form at an exhaust cap. It's rarely a lasting problem in north Alabama, but a vent cap with a screen or the wrong fitting can clog with debris or nests.

Renovations

Finishing a basement, adding a room or replacing a section of slab can change how air moves under the house. The Alabama Department of Public Health recommends testing before and after major renovations. A system that worked before a remodel may need a second suction point afterward.

When the original installer is gone

Any certified mitigator can service a system they didn't install. Before you call, gather what you can:

The fan's make and model, printed on the label on the fan housing.
Any paperwork: the installation report, the post-mitigation test or the warranty card.
Your most recent radon test results, and when the problem started.
Photos of the fan, the manometer and the pipe route.

Expect the technician to check the fan, inspect the pipe route, look for new slab cracks and recommend a retest after the repair. If the installing company closed, its warranty is usually gone too, but the fan itself may still be under the manufacturer's warranty.

Repair or redesign?

If the system never brought levels below 4 pCi/L, a new fan won't fix it. That points to a design problem: not enough suction points, a fan too small for tight clay soils, or an unsealed sump or crawl space. A good mitigator will run diagnostics before recommending more equipment. See sub-slab depressurization and crawl space systems for how designs differ.

Selling a house with an older system

A buyer's inspector looks at the manometer, the fan and the vent location. A recent test showing the system works is the best answer to their questions. See real estate radon testing.

Frequently asked questions

How do I know if my radon fan stopped working?

Check the manometer on the pipe. If both sides of the liquid are level, the system isn't pulling suction. Listen for the fan's hum and check its breaker or GFCI. A retest or a continuous monitor confirms whether radon has climbed.

Who can fix my radon system if the installer went out of business?

Any certified mitigator can service a system they didn't install. Have the fan model, any paperwork and your recent test results ready. Call us and we'll connect you with a local professional.

How long does a radon fan last?

It varies by model, conditions and hours of use. Fans run nonstop and eventually wear out. Check your fan's manufacturer warranty, keep an eye on the manometer and retest every two years, as the EPA recommends.

Why is my radon pipe gurgling or dripping?

Condensation from humid soil gas usually drains back down the pipe. Gurgling or drips at a joint can mean a section is sloped the wrong way or sagging, which an installer can correct.

My radon fan keeps tripping the GFCI. Is that dangerous?

Repeated tripping can mean water in the fan or the wiring. Leave it off and have a professional check it. Don't bypass a GFCI.