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Ariston Flow Group 999609

Ariston

Ariston Flow Group 999609

Ariston 999609 flow group (diverter valve) for Microcombi 23 MFFI boilers.

At a glance

  • Also known as 1577750, N7148
Manufacturer part no.
999609
Showing prices

£208.97

£174.14 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 Ariston 999609 is a flow group, classified as a diverter valve, for Ariston Microcombi 23 MFFI gas boilers. It manages the diversion of water between the domestic hot water and central heating circuits. This component is specific to the Microcombi 23 MFFI range.

Signs this part needs replacing

  • No hot water when a tap is opened, despite the boiler firing.
  • Heating operates when only hot water is demanded, or hot water runs when heating is selected.
  • Radiators fail to heat even though the boiler is operating.
  • Water leaking from the diverter valve body.
  • Boiler locks out or displays a fault code related to the diverter valve or hot water.

Before you order

  • Confirm your boiler model is Ariston Microcombi 23 MFFI.
  • Check the serial number falls within the range 2320018200001 to 2320033400001 for the base model, or matches the Edition 1 variants.
  • Verify the part number 999609 matches the component being replaced.
  • Ensure the diverter valve is the confirmed cause of the fault before ordering.

Not sure which part?

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