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Johnson & Starley Complete Electrical Panel (MAF) B500-0516000

Johnson & Starley

Johnson & Starley Complete Electrical Panel (MAF) B500-0516000

Complete electrical panel (MAF) for Johnson & Starley JB40-50 boilers, supplied as a single assembly.

At a glance

  • Appliance family: JB40-50
  • Also known as 1691774
Manufacturer part no.
B500-0516000
Showing prices

£673.34

£561.12 ex. VAT · VAT at 20%

Available to order · 3 working days
Available to order · 3 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The complete electrical panel (MAF) is a Johnson & Starley control assembly used on JB40-50 boilers. It carries the boiler's electrical control and connection points within a single panel unit. It is supplied as a complete assembly rather than as individual components.

Signs this part needs replacing

  • The boiler will not power up or respond to a demand for heat.
  • Controls behave erratically, with intermittent operation or repeated lockouts.
  • Visible burning, scorching, arcing or heat damage on the panel or its terminals.
  • A fuse or protective device on the panel repeatedly fails.
  • Loose, corroded or brittle connections that cannot be made good.

Before you order

  • Confirm the boiler model from the appliance rating plate matches the JB40-50 range.
  • Check the part number on the existing panel against B500-0516000.
  • Isolate the electrical supply and verify the fault is at the panel before ordering.
  • Check that the panel connectors and mounting points match those on the appliance.

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.