Keen Home Smart Vent is typically used to improve room-to-room comfort by modulating airflow, often as part of a zoned or smart-HVAC strategy. A "Bluetooth radio failure" (or broader wireless failure) can turn the vent into a fixed register, which may still be usable but undermines the point of the system.
Repair is worthwhile when the issue is simple-battery corrosion, weak batteries, or a bridge/network configuration problem-because the mechanical vent hardware may be fine. If the radio module itself is failing, component-level repair is often impractical for consumers, and replacement is usually the fastest way to restore consistent control.
Also consider system context: if you rely on multiple vents, one failing unit can create uneven pressure and comfort issues. When repair effort (diagnosis time, parts shipping) approaches the low threshold, swapping the vent is typically the most cost-effective reliability choice.