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Baxi 5112657 Potterton & Main (Honeywell SM11450) Printed Circuit Board (PCB)

Baxi

Baxi 5112657 Potterton & Main (Honeywell SM11450) Printed Circuit Board (PCB)

At a glance

  • Part type: Printed circuit board (PCB)
  • Also known as 1123771, N0658-3
Manufacturer part no.
BAXI5112657
Showing prices

£112.32

£93.60 ex. VAT · VAT at 20%

In stock
Order within 15h 22m for same-day dispatch
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Baxi 5112657 is a printed circuit board (PCB) for Baxi heating appliances. It is the main control board that manages the appliance's operating sequence, including demand recognition, fan and pump control, ignition, and flame supervision. The board also handles safety lockouts and fault signalling. A faulty PCB can prevent the appliance from operating or cause intermittent faults. PCBs are sensitive to moisture, power surges and heat, and can fail over time. This replacement is supplied under Baxi part number BAXI5112657.

Signs this part needs replacing

  • The appliance does not power up, or the display remains blank.
  • The boiler fails to fire, or fires and then locks out shortly after.
  • Fault codes or lockout errors appear repeatedly on the control panel.
  • The appliance responds erratically to heating or hot water demand.
  • There are visible signs of damage on the board, such as burn marks, corrosion or swollen components.
  • The appliance behaves differently after a power interruption or reset.
  • The pump or fan runs continuously without demand.

Before you order

  • Check the appliance's model and serial number to confirm the correct PCB variant.
  • Compare the part number on the existing board with 5112657.
  • Ensure the replacement board matches the connector layout and mounting points of the original.
  • Check for any service bulletins or revised part numbers from Baxi.

Not sure which part?

Tell the parts assistant what it's going into — the appliance make and model, or the GC number off the data badge — and it will check this part is on the fit list.