WASHINGTON – A serious software problem with two models of automatic external defibrillators has led their manufacturer to recall thousands of the devices distributed worldwide.

Defibtech LLC said problems with the software in its Lifeline AED and ReviveR AED models may fail to flag a previously detected low battery during some tests. If that occurs and the battery is indeed drained, the device may not be able to deliver the defibrillation shock needed to restart a person’s heart.

“This doesn’t become apparent until the battery gets low for some reason,” company president Gintaras Vaisnys said. “Given every battery will get low someday, this is an issue.”

The Guilford, Conn., company said it was recalling 42,000 of the devices, now in use in schools, fire stations, health clubs and hotels worldwide. It notified its distributors and customers by letter on Feb. 22 of the recall, prompted by three reports of cases where the devices failed to work. Vaisnys could not provide details.

The recall affects all Lifeline AED and ReviveR AED automatic external defibrillators that have software versions 2.002 and earlier, the company said.

Customers with questions also can call the company at: (877)453-4507 or (203)453-4507.