Make shure that the the filter in the bottom of the valve is clean. Turn water off use a 1/2 & 7/16 wrench to take apart the bottom connection on valve use a small screwdriver and push the small screen out and clean then put it back together.Use the same wrenches and take apart the top of valve clean inside valve and clean small orfice in plastic water line put back together. Make shure 24volts is gettin to valve you should her a click when furnace is running or fan. It may take a couple times to clean. Hope this helps