This Burner Control has been discontinued by the manufacturer. 
A newer Burner Control can be made compatible with the following heaters with the installation of additional parts.
KBE5S over voltage, 3 led lights, years of manufacture from 2006/2007 lot J-04 until 2012/2013 lot D-05.
After the adaptation, you will have only 2 led lights instead of 3 but it will allow your heater to function.
 
If you order the KSL-B-25C Burner Control, you will receive the following:
     KSL-B-25F Burner Control
     KSL-B-19C Power Cable
     KSL-B-52 Operation & Change Over Switch Cord
     KSL-B-43A Thermostat Cable
     KSL-B-46A Tip-Over Switch Cord
     KSL-B-11A Flame Monitor
 
This will replace manufacturer number: 50300 201032