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Potterton Flow Controller NXR4-8 5139878

Potterton

Potterton Flow Controller NXR4-8 5139878

Potterton Commercial flow controller NXR4-8, part number 5139878, for NXR4I series gas boilers.

At a glance

  • Appliance family: NXR4I
Manufacturer part no.
5139878
Showing prices

£372.88

£310.73 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 FLOW CONTROLLER NXR4-8 is a flow switch component manufactured by Potterton Commercial. It is listed as part number 5139878 and is used within the NXR4I range of Potterton Commercial gas boilers. The controller monitors water flow through the appliance and provides the signal that allows the boiler to prove circulation before firing.

Signs this part needs replacing

  • The boiler fails to fire despite the pump running and the system calling for heat.
  • A flow-related fault code or lockout appears on the boiler controls.
  • Intermittent operation, with the boiler cutting out shortly after ignition.
  • The burner fires with the pump off or with no circulation proved.
  • Visible damage, contamination or sticking at the flow switch body.

Before you order

  • Confirm the appliance model and section count against the fit list above.
  • Check the existing component or its label for the part number 5139878.
  • Verify that the fault is traced to the flow controller rather than the pump, sensor or wiring.
  • Check the appliance documentation for the correct location and access route before starting work.

Not sure which part?

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