Please make sure that the jacket is plugged into a charged battery. Also, double check to see that the gloves are unplugged. If the gloves are plugged into the jacket, the pocket warmers will turn off. Once the jacket is plugged into a charged battery and there are no gloves connected, located the button with the hand symbol on the inside left chest area. Press and hold for 3 seconds until the LED lights turn on. Click the button until it goes to the high red setting. You should start to feel the heat within 30 seconds.