Potterton PCB FS110 5142463

This is the printed circuit board for Potterton Commercial appliances, supplied under part number 5142463 and identified by Potterton as PCB (FS110). It is the complete control board for the boiler, handling ignition sequencing, temperature regulation, fan and pump control, and safety interlocks. The board is listed against the Potterton Commercial Sirius 2 and Sirius 3 range.

• The boiler locks out and will not complete an ignition sequence, with a fault code pointing to the control board.
• The appliance behaves erratically, with intermittent firing, unexplained shutdowns or repeated lockouts.
• Displays, LEDs or status indicators on the board are dead or inconsistent.
• Visual damage on the board, such as burnt tracks, scorching, bulging capacitors or corrosion.
• No response to the thermostat or programmer, or the fan and pump are not being driven.

• Confirm the part number 5142463 against the label on the existing board.
• Check the boiler model and variant against the fit list, as FS90 and FS110 versions differ across the Sirius 2 and Sirius 3 ranges.
• Note the board's connection layout and wiring before removal so the replacement is refitted correctly.
• Verify that the fault is diagnosed to the board rather than a sensor, thermostat or wiring fault.