Question
Is there a replacement control that will just plug into the hardie hha 11272

Answer
Hey Don, I believe this model number is actually called the "Rain dial" controller. Hardie was bought out by Irri-trol, and Irri-trol still manufacturers this controller. You can just purchase the panel, and not the whole controller and case. This panel can just be plugged in to the back of the old controller. Keep in mind, sometimes the circuit board on these units go bad, and to purchase the whole controller is probably only going to be about $40.00 to $50.00 difference. It might be better to purchase the whole controller, even though it will take  more time to install it. good luck and have a great day.