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Just to expand, when I switched it on the other day the middle red light came on and stayed on. I thought I'd give it another go before I think about buying a new one, so I've switched it on, the red light has come on and I've also pressed the other button and the orange light has come on, so now I have two buttons on, help, what does it all mean. This freezer was in the house when we moved in so have no idea of age, except that it's over 7 years old.