Control module Viessmann Vitopend 100 WHO 7827494

Original control unit (automation board) for Viessmann Vitopend 100 WH0A series gas boilers. This board is the "brain" of the boiler, responsible for controlling all operating modes, safety monitoring, and user interaction via the control panel. If your boiler does not start, displays errors, does not respond to commands, or operates incorrectly, the cause is often a malfunction of this component. Technical specifications: Parameter Value Part numbers 7827494, 956.124.002 Manufacturer Viessmann (Germany) Type Analog control unit Compatibility Viessmann Vitopend 100 WH0A (24 kW) Number of buttons 2 Dimensions (L x W x H) 505 x 240 x 175 mm Net weight 4.44 kg Warranty 6 months (when installed by an authorized service center) Compatibility The Viessmann 7827494 control unit is installed on the following wall-mounted gas boiler models: Viessmann Vitopend 100 WH0A Kombi-RA (24 kW) — main compatible model. Viessmann Vitopend 100 WH0 Kombi RU EG-E (24 kW). Control Vitopend 100. Important: Make sure your boiler is exactly the WH0A series with two buttons on the panel. This board differs from the control unit for the WH1B series. Obsolete part numbers (analogs replaced by this unit): 7826619, 7825720, 7823277, 7817520. ⚙️ 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, does not switch modes) or to signals from an external thermostat. Incorrect operation: Heating or DHW does not turn on/off, the fan operates unstably, no ignition spark. Visual