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Johnson & Starley 3 Port Diverter Valve 1000-0300200

Johnson & Starley

Johnson & Starley 3 Port Diverter Valve 1000-0300200

Three-port motorised diverter valve for Johnson & Starley Aquair boilers, part 1000-0300200.

At a glance

  • Appliance family: Aquair
  • Also known as 1691475
Manufacturer part no.
1000-0300200
Showing prices

£346.85

£289.04 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

Johnson & Starley 1000-0300200 is a three-port motorised diverter valve. It is used in the Aquair range of gas boilers to control water flow between the central heating and hot water circuits. The valve is listed as a Drayton motorised valve.

Signs this part needs replacing

  • No hot water when the heating is running, or heating when only hot water is selected.
  • The valve actuator does not move when the boiler switches between heating and hot water.
  • Radiators heat up when only hot water is demanded.
  • The valve body leaks from the spindle or motor housing.
  • The boiler fails to switch between heating and hot water modes.

Before you order

  • Confirm your appliance model appears in the Fits list above.
  • Check the part number on the existing valve matches 1000-0300200.
  • Verify the valve is a three-port type and the connections match your installation.

Not sure which part?

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