If you are shopping for a new, energy efficient appliance, and thought all you needed to do to was look for the yellow EnergyStar tag, think again.

The Department of Energy has released new findings that show a handful of appliances may not be as energy efficient as advertised because of problems with the “energy star” labeling program.

That little yellow sticker you see on some new appliances is supposed to guarantee an appliance is in the top 25% of energy efficiency, but an internal audit, just released, shows that the Department of Energy has not been properly tracking how the star has been used.

Initially manufacturers would self-report whether their products met the energy star guidelines, but with the new revelations, that’s changing.

Industry watchdogs are quick to point out, despite a few problems, the energy star program is not a washout.

“It’s not like we found rampant cheating and mis-representation in our testing,” said Celia Kuperszmid Leharman of Consumer Reports. “I think that for now that the stickers are pretty reliable, and they’re good comparative things from one product to the next.”

Before you purchase a new appliance, check out the Department of Energy’s consumer’s webpage for news on energy efficient appliances.