Glow-worm S1047000 printed circuit board

A genuine Glow-worm printed circuit board for Themaclassic, C-CI and SI boilers. The control centre of a boiler, the printed circuit board (PCB) monitors and controls every process occurring throughout a system via switches, thermostats and sensors. It enforces safety measures too, shutting down boiler functions if internal readings indicate any fault such as high pressure or low water levels.