Sears Canada is warning consumers about safety hazards with certain models of Frigidaire and Kenmore stoves sold across the country over a seven-year period. The company says the warnings apply to smoothtop freestanding electric ranges with rotary knobs and digital displays. Sears says the stoves’ elements may heat up without being turned on, fail to cool down after being turned off, or heat to different temperatures than those specified by users. The ranges were sold in retail stores, online and through the company catalogue between June 2001 and September 2008. Sears says it will contact customers who bought the affected units to arrange a free repair, and urges consumers not to use their stoves until the problem is dealt with. Customers with questions are urged to call Sears at 1-866-691-9948.