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Indoor air

Check the radon system's warning indicator without opening it

A radon-reduction system can look unchanged even when its fan or airflow is no longer working as intended.

Homeowner guidance with clear stop points

When it usually needs attention

Ongoing home-care habit

EPA says to look at the system warning device regularly; the installer instructions define the normal indication.

When this guide applies

Only applies when a radon-reduction system is confirmed.

What to do

Find the system label and warning device, compare the visible reading or light with the installer instructions, and record any change without adjusting the system.

Applies when: Only applies when a radon-reduction system is confirmed.

Who should handle it: Residents may observe a labeled indicator; testing, diagnosis, fan replacement, piping, electrical work, and system changes belong to the responsible owner and a qualified radon professional.

Tools

  • Installer or system instructions
  • Flashlight
  • Phone camera or written log

Parts and supplies

  • No replacement part for observation

Safety gear

  • None for an accessible visual check

Before you start

  • Identify the warning device and its normal indication
  • Keep the system label and installer contact available

Power, water, or fuel shutoffs

  • Do not unplug or switch off a radon fan for this check

Cleaner or chemical limits

Use no cleaner, lubricant, sealant, or spray on the fan, gauge, alarm, pipe, or electrical parts.

Stop and get help when

  • Do not climb, open a fan or electrical box, disconnect piping, or enter an unsafe crawlspace or attic
  • Treat an alarm, stopped fan, damaged pipe, unusual noise, or changed gauge as a service condition

Who to call: Use a qualified radon mitigation professional and the responsible owner for diagnosis, repair, or uncertain operation.

Reviewed sources