Radon System Repair
Radon System Repair, Fan Replacement, Inspection, and Maintenance
A radon system is a continuously operating mechanical system. Fans wear out, alarms lose batteries, crawl-space membranes can be damaged, condensate can collect in piping, supports can loosen, and renovations can change how the foundation communicates with the system.
Colorado treats professional radon-system repair and modification as mitigation work. Use a currently licensed Colorado Radon Mitigation Professional rather than an ordinary handyman, electrician, roofer, plumber, or HVAC contractor acting alone.
A manometer reading shows pressure in the pipe; it does not show the indoor radon concentration. The only way to confirm performance is with a radon test.
Signs Your Radon System Needs Attention
- The alarm sounds, flashes, or no longer responds to its test button
- The fan is silent, unusually loud, vibrating, hot, or making bearing noise
- The manometer has returned to zero or changed substantially from the documented normal reading
- Piping, couplings, supports, labels, or electrical components are loose or damaged
- Water can be heard in the pipe or condensate is leaking near fittings or the fan
- A crawl-space membrane is torn, detached, open around a pier, or disturbed by another trade
- A sump lid, drain, cleanout, or foundation opening has been altered
- The building was remodeled, expanded, waterproofed, or had major HVAC or foundation work
- A new radon test is elevated or materially higher than earlier post-mitigation results
- No one can identify who installed the system or provide a post-mitigation report
Common Service Calls
Fan Replacement
We identify the existing fan, pressure, airflow needs, route, pipe size, noise concerns, condensate conditions, electrical connection, and warranty status before selecting a replacement.
Alarm and Monitor Service
A failed battery, disconnected sensor, zero-pressure condition, or damaged device is diagnosed rather than silenced without finding the cause.
Condensation and Water
Radon piping moves warm, moist soil gas. Poor pitch, low points, exterior exposure, blocked drainage, or an unsuitable fan location can allow water to collect and shorten fan life.
Crawl-Space Membrane Repair
Seams, walls, piers, access areas, penetrations, and suction connections are evaluated so the membrane continues to function as the gas-control boundary.
Performance Troubleshooting
If a post-test is elevated, the licensed professional evaluates fan operation, pressure-field extension, foundation zones, leaks, additions, passive-system components, and whether added suction or a design correction is needed.
Pre-Sale System Inspection
We can document visible components, operation, monitoring, route, discharge, labels, fan condition, crawl membrane, and recommended testing before a real estate transaction.
What Happens During a System Inspection
- 1
Review the history
We ask for the original proposal, installer, license information, post-mitigation result, fan model, warranty, prior service, current test, and building changes.
- 2
Inspect visible components
The technician reviews the suction point or membrane connection, piping, supports, fan, electrical supply, couplings, monitoring, labels, discharge, and accessible foundation details.
- 3
Measure operation
System pressure and other diagnostic information are compared with the configuration and any prior baseline. Additional communication testing may be recommended.
- 4
Repair the identified condition
The written scope distinguishes a simple component replacement from a system modification, added suction point, membrane repair, reroute, or electrical correction.
- 5
Retest
A radon test verifies the indoor concentration after a meaningful repair, fan change, system modification, or unexplained performance concern.
Planning Prices for Common Service Work
Drennen 2026 service records include no-charge warranty visits, minor adjustments, ordinary troubleshooting, fan replacement, and more involved repairs. Many paid service visits fell between approximately $100 and $900. Straightforward out-of-warranty fan replacements commonly appeared near $350 in the early-2026 records, while complex repairs or added mitigation can cost more.
These are historical planning figures, not a current quote. Fan model, electrical work, access, pipe size, pressure, route, warranty, travel, system condition, and needed correction determine the actual price.
Do Not Turn the Fan Off to Save Electricity
Active radon systems are generally intended to operate continuously. Turning the fan off can allow indoor radon to rise and can make a property owner believe the home is protected when it is not. If noise or energy use is a concern, have the design evaluated rather than using a timer or switch as a workaround.
Maintenance and Retesting
- Look at the warning device and pressure indicator regularly
- Listen for a change in fan sound or vibration
- Keep the fan, electrical connection, labels, and monitor accessible
- Protect crawl-space membrane and piping when other trades enter the area
- Retest at least every two years and after repairs, alterations, additions, HVAC changes, foundation work, or significant ground disturbance
- Keep test reports, service invoices, photographs, warranty, fan information, and the normal manometer reading with the property records
Frequently Asked Questions
Restore Confidence in the System
Drennen can inspect the existing system, identify the licensed scope, explain repair options, document the work, and arrange appropriate post-service testing.
Schedule Radon System ServiceRepair and modification requirements vary. Confirm current DORA license status, electrical and permit requirements, warranty coverage, and testing protocol before authorizing work.
Drennen Custom Contracting | Serving Fort Collins and Northern Colorado | 970-482-9100 | [email protected]