> ## Documentation Index > Fetch the complete documentation index at: https://docs.sonohealth.com/llms.txt > Use this file to discover all available pages before exploring further. # AirPro Air Purifier Troubleshooting — Common Issues & Fixes > Troubleshooting guide for the SonoHealth AirPro HEPA 14 Air Purifier. Fix power issues, reduced airflow, unusual noise, filter indicators, UV-C questions, and odor concerns. ## Device Won't Turn On * **Check the power connection** — ensure the power cord is firmly plugged into both the unit and the wall outlet. Try a different outlet to rule out a dead socket. * **Check the outlet** — plug another device into the same outlet to confirm it has power. * **Hold the power button** — press and hold the power button for 2–3 seconds rather than a quick tap. * **After a power outage** — the AirPro does not auto-restart after a power interruption. Press the power button to restart. ## Reduced Airflow or Poor Performance * **Check the filter** — a clogged or saturated filter is the most common cause of reduced airflow. If the filter indicator light is on, replace the filter immediately. * **Remove obstructions** — the AirPro uses 360-degree air intake. Ensure nothing is blocking the sides or top of the unit. Keep at least 12 inches of clearance on all sides. * **Check the pre-filter** — the pre-filter can accumulate dust, hair, and pet dander over time. Gently vacuum the pre-filter with a brush attachment to restore airflow. * **Room size** — the AirPro covers 430 sq ft in 10 minutes and 1,200 sq ft in 30 minutes. In rooms significantly larger than 1,200 sq ft, performance will be reduced. Consider adding a second unit. ## Unusual Noise or Vibration * **Check filter seating** — remove the filter and reinstall it, ensuring it is properly seated and aligned. A misaligned filter can cause vibration or rattling sounds. * **Check for foreign objects** — inspect inside the unit for any debris, packaging material, or objects that may have fallen in through the air intake. * **Surface check** — place the AirPro on a flat, stable surface. An uneven surface can amplify vibrations. * **Fan speed** — the AirPro operates between 25 and 50 dB. Higher fan speeds produce more audible airflow noise, which is normal. Night Mode (25 dB) is the quietest setting. ## Filter Indicator Light Is On The filter indicator light means the built-in lifetime tracking system has detected that the filter has reached its replacement threshold. This is based on cumulative runtime, not a fixed calendar date. **Action required:** Replace the filter. Order replacement filters at [SonoHealth.com](https://sonohealth.com/products/airpro-replacement-filter-compatible-with-airpro-purifier) — $29.99 (1-pack), $49.99 (2-pack), or \$79.99 (4-pack). The filter subscription delivers replacements every 90 days at 20% off. Do not wash, rinse, or vacuum the HEPA 14 filter. Doing so will damage the filter media and void its 99.995% filtration rating. ## UV-C Light Not Visible **This is normal.** The UV-C sterilization light operates at 254 nm — a wavelength that is invisible to the human eye. You will not see a visible glow from the UV-C function during normal operation. Check the UV-C indicator on the control panel to confirm the function is active. If the UV-C indicator shows the function is off, toggle it on using the control panel. ## Odors Not Reducing If the AirPro is running but odors (cooking smells, smoke, chemical fumes) persist: * **Replace the activated carbon filter** — the activated carbon stage is responsible for adsorbing gases and odors. Once the carbon is saturated, it can no longer capture new odor molecules. Replace the filter. * **Check the source** — the AirPro removes airborne odors but cannot eliminate the source. If a persistent odor exists (mold, sewage, gas leak), address the source directly. * **Increase fan speed** — higher fan speeds circulate more air through the carbon filter per minute, which may help with strong odors. * **Room ventilation** — for heavy odor events (painting, cooking with strong spices), open a window briefly to dilute the concentration, then close it and let the AirPro clean the remaining air. ## Device Runs But Air Doesn't Feel Clean * **Allow adequate time** — the AirPro cleans 430 sq ft in 10 minutes. Larger rooms require 20–30 minutes for a full air exchange. * **Close doors and windows** — the AirPro is most effective in enclosed spaces. Open windows and doors continuously introduce new unfiltered air. * **Check filter age** — if the filter is approaching 12 months of use, its efficiency may be declining even if the indicator light has not yet triggered. Replace the filter. * **Multiple pollution sources** — homes with pets, smokers, or ongoing renovation may require more frequent filter replacement (closer to every 6 months). ## When to Contact Support Contact SonoHealth if: * The device does not turn on after verifying the power connection * Unusual noise persists after confirming proper filter installation * The filter indicator does not reset after installing a new filter * You suspect a manufacturing defect * You need warranty service (2-year standard, lifetime with subscription) Contact: [sonohealth.com/contact](https://sonohealth.com/contact) *** **Related:** [FAQ](/air-purifier/faq) · [How It Works](/air-purifier/how-it-works) · [Product Overview](/air-purifier/overview)