First check the red LED light, it could be flashing an error code, indicating the problem. It should flash twice, pause for 1 second and repeat the cycle for as long as the door is open. If it just does this once, it means the optics are blocked or defective. I'm sending you a chart for the Led light. If it's blinking normal, the icemaker will need to be checked. This icemaker module has some test terminals that may help determine what the problem is. To access the module, pull the front cover off of the icemaker and you will see the module. The terminals will be marked (see picture). Now use a well insulated jumper and place it between the L - V terminals. Be careful this is a hot (live) check. With the jumper in place, water should flow to the icemaker. If it does flow, the icemaker will need to be replaced. If no water flows but you can hear a buzzing noise, the water valve will need to be replaced. If nothing happens, some voltage checks will need to be made. A technician may be needed to make these checks. If you need more assistance, please resubmit your question, with additional details and please include a complete model number.