THIS WAS A VERY EASY JOB TO GAIN ACCESS TO THE PCB IT HAS 4 SCREWS SIMPLE.THE PART SITS ON THE BOTTOM OF THE BOARD ITS LIKE A MICRO SWITCH WHICH RECOGNISES WHEN THE HEATING HAS REACHED ITS TEMPERATURE TO WHICH YOU HAVE SET IT AND IT SHUTS OFF THE GAS THEN WHEN THE TEMPERATURE DROPS IT CONNECTS...