Vaillant 0020036861 Printed circuit board

The Vaillant 0020036861 is a printed circuit board (PCB) supplied as part of the Vaillant electronics and controls range of spares. It carries the control electronics for the appliance and sits within the boiler spares group covering printed circuit boards. The board is supplied as a single unit and is covered by a one year manufacturer guarantee.

• The appliance fails to fire, or locks out shortly after a call for heat or hot water.
• The control panel or display is blank, flickers, or shows repeated fault codes that clear only temporarily.
• Heating or hot water output becomes intermittent, with the appliance cutting in and out without an obvious external cause.
• Visible damage on the board itself, such as scorch marks, discoloured tracks, bulging capacitors or a blown on-board fuse.
• Faults that persist after the external controls, sensors and wiring have been checked and confirmed sound.

• Read the part number printed on the existing board and match it to 0020036861, as board layouts can differ between revisions of the same appliance.
• Check the appliance model and serial plate, then confirm the entry in the compatibility list below.
• Isolate the electrical supply at the fused spur before removing or refitting the board, and take a photograph of the plug connections before disconnecting them.
• Confirm whether any gasket, seal or mounting clip is disturbed during removal and needs replacing at the same time.