The Potterton printed circuit board is the boiler's central control, monitoring and controlling every process via switches, sensors, and thermostats. It enforces safety protocols, ceasing boiler function if internal readings indicate an error. This board acts as the boiler's brain, programmed to ensure all operations run correctly. Boiler spare parts must be fitted by a certified Gas Safe engineer. Orders received before 4 pm are usually dispatched for next business day delivery. Please note - this boiler part is non-returnable.