When the start button blinks, does it do it seven times? When you have to play around with the control are you hitting certain buttons to reset it?
Yes this sounds like a control issue. You can order it at the following link, it is item number 11 on the diagram. I wanted to make sure it wasn't a heating system failure. The start light will blink 7 times when it is a heating system failure. To replace the control, remove power from the unit, remove the six screws around the control panel, pull down the panel and you can then access the control.