Cybex is recalling about 19,000 treadmills because they can speed up unexpectedly due to a malfunction with the lower control board, posing a fall hazard to consumers.

Consumer Affairs.com reported Cybex International has received 24 reports of incidents involving the treadmill unexpectedly increasing speed, including six reports of consumers falling. Three of those incidents resulted in minor injuries.

The recall involves the Cybex 445T, 455T, 530T, 450T, 500T, 515T, and 520T treadmill models.

The treadmills are black and gray with rectangular uprights. The 530T style treadmill is 81 inches long by 32 inches wide. The 445T style treadmill is 72 inches long by 32 inches wide. The treadmills have a display panel on a console as wide as the treadmill. Cybex and the model number are written on the console.

Cybex International and Cybex dealers nationwide sold the treadmills from January 2001 through September 2008 for between $5,500 and $7,000. They were made in the United States.

Consumers should immediately unplug and stop using the recalled treadmills. Contact Cybex to receive a free replacement fuse. If requested, a Cybex technician can install the fuse free of charge. Cybex is directly contacting known purchasers.