The dial on the battery pack or on the headlamp turns hard? I had a problem with one of the heads on a nite light and there was a faulty part in the headlamp. Call nite light and they will take care of it. When mine broke they offered to fix it for nothing, was right in coon season so I didn't want to send it in. They faxed me a diagram the next day on how to repair it and shipped the part express mail. The tech guy told me to call if I was having trouble and he would talk me through it. I've had great luck with them.