Radon fan replacement in Central Ohio: signs, checks, repair

The gauge on your radon pipe reads flat, the alarm is chirping, or the attic fan has started to rattle. Any of those can mean the system that kept your basement under the action level has stopped doing its job, and the usual culprit is the fan. Here is how to tell, what to check yourself, and what a proper replacement looks like under Ohio's rules.

Symptoms that point at the fan

A radon fan runs every hour of every day, so it rarely fails with any drama. Watch for these:

• The liquid in both legs of the U-tube manometer sits at the same height, meaning the pipe has no suction.
• The reading has wandered well away from the line marked on the gauge at start-up.
• The fan-failure alarm is sounding or its indicator light is on.
• The fan sounds different: grinding, rattling, a higher pitch, or no hum at all.
• Water drips from a joint, or you hear it sloshing in a flat run of pipe.
• A routine retest comes back well above the number you had after the install.

A level manometer is not a glitch; it is the system telling you no air is moving. Our page on whether your system is working goes deeper on the gauge, and the fan noise FAQ separates a normal hum from a bearing on its way out.

Reading the manometer against the start-up mark

Under the Ohio Radon Mitigation Standards, every active system carries a monitor: a gauge that shows the fan is working, or a device that warns when it fails. When that monitor is a manometer, the reading at start-up gets marked on it, and the owner receives that pressure in writing. The mark is the baseline for every later glance.

• At or near the mark: the fan is pulling about what it pulled on day one. Small seasonal movement is normal.
• Well below the mark, or at zero: think weak fan, lost power, or an air leak at a joint or coupling.
• Well above the mark: the fan is fighting more resistance than before, which can point to water pooled in a low run, ice, or debris in the line.

Glance at the gauge once a month, the same way you check the furnace filter. If there is no mark and no paperwork, which is common with a system that came with the house, ask for the records. The Ohio standard keeps a system's floor plan drawing available to the client and to later owners on request, and a new install comes with a closeout package naming the installer, with a phone number and Ohio license number.

Checks to make before you call

None of these need a ladder, and most take a few minutes.

• Find the breaker labeled for the radon system and confirm it has not tripped. Ohio requires a label on the breaker as well as on exposed pipe.
• If the fan is outdoors, check the disconnect switch mounted near it. If it plugs into an attic outlet, confirm the outlet has power.
• Rest a hand on the pipe near the fan. A running fan leaves a faint vibration; a dead one is still.
• From the ground, look at the roof discharge for anything crushing or blocking it. Do not climb up.
• Find the install date in your paperwork and write down today's gauge reading.

Whatever you find, leave the fan running. EPA's guidance is plain that a radon fan should never be turned off: not to save electricity, not to quiet it overnight. With the fan off, a mitigated basement is back to behaving like an unmitigated one.

On age, EPA notes that fans may last five years or more, while manufacturer warranties tend not to exceed five years. A fan well past that point that starts grinding is usually telling the truth about its bearings.

What the repair visit involves

The visit starts with diagnosis, because a dead fan, a dead circuit and a cracked coupling can all look the same on the gauge. Once the fan is confirmed as the fault, the replacement follows the standard.

A correctly built system lets the fan come out at its couplings, with no pipe cut. Ohio requires every joint to be glued permanently except the removable couplings at the fan, precisely so the fan can be serviced.

• The new fan comes from a manufacturer that lists radon mitigation as an intended use.
• It sits in a vertical run of pipe, mounted so it does not pass vibration into the framing.
• Wiring gets checked too. An exterior fan should be hard-wired, with an outdoor disconnect in sight of the fan and within 4 feet of it. A plug-in cord should be no longer than 6 feet and never pass through a wall.
• The new start-up pressure is read, marked on the manometer, and written down for you.

System repair and fan work runs $200 to $600 in Central Ohio. Where a job lands in that range depends mostly on how hard the fan is to reach and what else the diagnosis turns up.

When an older system falls short of the Ohio standard

If you own an older home in Worthington, Clintonville or anywhere else around Columbus, the system you inherited may not match what the standard asks for today. Two examples: a fan mounted in the basement, and a rain cap on the discharge. The standard places fans only in an attic, in a garage that is not under living space, or outdoors, and it rules out rain caps entirely.

The rule on what that means for a repair is practical. Replacing a worn-out fan and leaving the rest untouched does not count as altering the system under Ohio's standard, so a like-for-like swap does not force a rebuild. Moving the fan or rerouting the pipe does change the system, and an altered system has to be brought up to the standard. In both cases, an Ohio licensee who services a system that falls short must tell you in writing that it does not comply.

Treat that written note as information rather than a sales pitch. It lets you choose between a fresh fan in the old layout now and bringing the whole system current, and it leaves a clear record for whoever owns the house after you.

Retest after the repair

For a new install, Ohio rules say the first follow-up test should happen no sooner than 24 hours and no later than 30 days after the fan starts. Hold a repaired system to the same yardstick: let the new fan run at least a day, then run a short-term test.

Test in the same spot as your earlier results so the numbers can be compared honestly. If the reading is back near your post-install result, return to routine testing, which EPA advises at least every two years. If it is still high with a healthy fan and a steady gauge, the fan was not the whole story, and our guide to radon coming back after mitigation covers the usual suspects, from new slab cracks to a finished basement that changed how air moves.

Your next step: read the manometer tonight and compare it to the mark. If it is flat, drifting or unmarked, call or text us with the reading and the fan's install date, and we will help you sort out whether you are looking at a fan, a circuit or something else before anyone opens the attic hatch.