Trusted Federal Heights Radon Mitigation

A fan motor that hums but does not spin typically indicates that the run capacitor has failed. The capacitor provides the electrical boost needed to start the motor spinning, and without it, the motor receives power but cannot overcome its own inertia. Running a motor in this condition for extended periods can cause it to overheat and burn out the windings, turning a capacitor replacement into a full fan replacement. Because capacitor replacement requires electrical work and the repair cost often approaches the cost of a new fan, most contractors recommend replacing the entire fan unit when this issue arises.

Once a properly sized and installed fan begins running, the system typically reaches stable negative pressure beneath the slab within minutes to hours. However, radon levels in the indoor air may take 24-48 hours to fully equilibrate to the new lower levels, as radon that has already accumulated indoors slowly disperses. Do not assume the system is working based on feel alone - always confirm with a proper test device.

Start by checking the electrical panel for a tripped breaker or blown fuse, as power surges during outages or at restoration can trip circuit protection devices. If resetting the breaker restores power to the fan circuit but the fan still does not run, the motor may have been damaged by a voltage spike during the outage. Some homeowners choose to install a surge protector on the radon fan's dedicated circuit to prevent this type of damage in the future. If the fan does not restart after the breaker is reset, contact a radon contractor to test the fan motor and recommend repair or replacement.