Vaillant 0010028086 EcoTEC Plus & Pro Main Printed Circuit Board (PCB)

The Vaillant printed circuit board (PCB) is the main control board fitted inside Vaillant domestic heating appliances. It carries the processor and switching circuitry that sequence ignition, drive the pump and fan, regulate flow and return temperatures and monitor fault conditions. This board is listed under part number 0010028086, with 10028086 and 0020108264 as alternative numbers. It is supplied as a service replacement item and connects to the appliance wiring harness, temperature sensors and gas valve controls.

• The boiler fails to fire or repeatedly locks out with no mechanical cause found
• No heating or hot water even though the programmer or thermostat is calling for demand
• A blank or unlit display, or fault codes that return immediately after a reset
• Repeated fuse failure on the board, visible track damage, scorching or swollen capacitors
• The fan, pump or diverter valve is not being driven while the appliance is running

• Read the part number printed on the existing board and match it against 0010028086, 10028086 or 0020108264.
• Board revisions can differ between appliance variants, so confirm the number on the board itself rather than relying on the boiler model alone.
• Check whether a gasket, seal or mounting clip is needed alongside the board, as these are not always supplied with it.
• Isolate the appliance from the electrical supply before removing or refitting the board.