When I first got mine, (it was an automatic though) it did that as well. Kept burning all the time. However, did you check the contact under the atty for moisture? If that gets wet could be the problem. Best to take the battery and atty out, and take the cover off to check for leaking problems, clean with alcohol wipe. If that doesn't help probably will be a switch issue or circuit board problem. Also check wires under the atty contact, may have a broken wire. Last three items are replacement qualifiers. Hope your back-up is in good shape. Hate sending things in. But I would say that if it only flashes red, it's dead. I'm a poet!