Baxi Printed Circuit Board RDS System 18 720846201

The Baxi 720846201 is a printed circuit board (PCB) manufactured by Baxi for use in the Megaflo 2 System 18 Compact GA appliance family. It is the control board that manages the electrical sequence of the appliance, handling signal input from the sensors and switches and returning the outputs that drive the fan, pump and ignition sequence. Because it sits at the centre of the appliance's electronics, a failed board typically shows up as a loss of control rather than a mechanical fault.

• The appliance shows no display or fails to power up when the supply is present.
• The boiler locks out repeatedly, or locks out immediately after a reset.
• The fan, pump or ignition sequence does not start when there is a call for heat.
• Operation becomes erratic, with intermittent faults that clear and return without any mechanical cause.
• Fault codes appear that point to the control board rather than to a sensor or switch.

• Confirm the appliance model and GC number against the compatibility list, as the same appliance name can appear with more than one GC reference.
• Check the part number printed on the existing board matches 720846201 before ordering.
• Isolate the electrical supply and follow the manufacturer's wiring and configuration instructions when fitting a replacement board.