An installed system is not a permanent fix
Local measurements and geology — not national boilerplate.
Radon fans run continuously — every hour of every day — and they wear out, generally somewhere in the five-to-ten-year range. When a fan fails in Stark County, the house does not drift back to a mildly elevated level; it returns toward its untreated baseline. Stark County sits on glacial till over fractured shale and limestone — uranium-bearing rock whose fractures give radon a direct path toward foundations. The failure is easy to miss because there is nothing to see or smell. The one indicator is the manometer — the small U-shaped gauge on the pipe. If the liquid in both legs has levelled out, the system is no longer pulling suction and the house is effectively unmitigated.
Sources: EPA Map of Radon Zones (Ohio); Ohio Department of Health; county-level radon measurement data
Common failures on Canton radon systems
A large share of Stark County repair calls trace back to the geology the system is fighting: fractured shale and limestone deliver soil gas unevenly, so a system that was marginal on day one — a single suction point on a house that needed two, or an undersized fan — may hold levels just under 4.0 for years and then lose ground as the fan ages. Ohio licenses radon mitigation contractors through the Department of Health, which matters on repair work: the license number tells you the person diagnosing your existing system is accountable to state standards, not just selling you a new fan.
The most common call is a dead or dying fan. A fan that has gone silent, or one that has become noticeably louder or started vibrating, is usually at the end of its bearings. Replacement is straightforward, but the replacement fan has to be matched to the original design — an undersized unit will not hold suction under the slab, and an oversized one wastes electricity and can pull conditioned air out of the house.
Other frequent problems: seal failures where the suction point meets the slab or around a sump lid, which let the fan pull room air instead of soil gas; cracked or disconnected pipe, often in an attic run or where the pipe exits; and systems that were undersized from the start and never actually got the house below 4.0 pCi/L. Any repair should end the same way an installation does — with a retest that proves the level came back down.
- Radon fan replacement, sized to the original system design
- Manometer diagnosis — confirming whether the system still pulls suction
- Re-sealing suction points, sump lids, and foundation penetrations
- Repairs and retesting on systems installed by other contractors
Related pages
Every page cites its sources — start where your question is.
Canton Radon System Repair — FAQ
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