The Vaillant printed circuit board is the boiler's central control. It constantly checks every process that occurs via the sensors, switches and thermostats. It also enforces the safety measures, making sure that the boiler ceases to function if any of the internal readings point to any fault in the boiler's operation. The printed circuit board is effectively the brain of the boiler. It is programmed to ensure everything is running as it should.

Brand Name	Vaillant