Burner control unit Viessmann 7819018

Original burner control board (automation unit) for Viessmann Vitopend 100-W series wall-mounted gas boilers (model WH1B). This board is the "brain" of the boiler, responsible for controlling ignition, power modulation, safety monitoring, as well as processing signals from sensors and user commands. If your boiler does not start, displays an error, does not respond to commands, or operates intermittently, the cause is often a malfunction of this component. Technical specifications: Part numbers: 7819018, 956.124.004. Manufacturer: Viessmann (Germany). Board type: Burner Control Unit. Compatibility: Viessmann Vitopend 100-W boilers, model WH1B. Purpose: Control of boiler operating modes (heating, DHW), ignition, modulation, diagnostics. Compatibility check (Key point) When searching for a control board for Viessmann boilers, it is critical to distinguish between models. Based on the provided numbers, it can be concluded: This board 7819018 and the unit with part number 7827494 (discussed earlier) are not interchangeable. They are installed on different generations of Vitopend 100 boilers. Typically, the WH1B model is recognizable by its external control panel, which has a rotary mode selector knob and a digital display. Your boiler model Board part number Control panel type Vitopend 100-W (WH1B) 7819018 (or 7831047) Rotary knob + display Vitopend 100 (WH0A) 7827494 Only 2 buttons (sometimes + analog display) ⚙️ Signs of malfunction and when to replace Malfunction of the control unit can manifest in different ways. Replacement is required for the following symptoms: Errors and failures: The boiler displays an error code related to electronics, or spontaneously restarts. No response: The boiler does not respond to commands from the control panel (does not change temperature) or to signals from an external thermostat.