Hi all. Just started on this forum. I have an issue with my Pentair 400 heater. I'm getting a service heater error. I troubleshot thru the manual and opened the side panels and saw that I have a HLS error light on. The blower does not turn on so nothing does. Manual says to replace the HLS. I called several local pool places and they all said something different from heater having two sensors and the other pool place saying there is a sensor and a high limit safety switch. So I'm confused as to what exactly HLS means.... High limit sensor or High limit safety switch haha. I turned the temp down below the current water temp and the service heater light went off but obviously didn't turn heater on because my pool water is already at 82 degrees. So what are your suggestions as to what is going on? Thank you in advance.