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Ferroli Flow Switch 39820820

Ferroli

Ferroli Flow Switch 39820820

Ferroli 39820820 flow switch for Domicondens and Fercondens HE gas boilers.

At a glance

  • Also known as 1211223
Manufacturer part no.
39820820
Showing prices

£46.43

£38.69 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 Ferroli 39820820 is a flow switch used in Domicondens and Fercondens HE gas boilers. It detects water flow through the heating circuit and signals the boiler's control board, allowing the appliance to prove circulation before firing. It is supplied as a Ferroli component under part number 39820820.

Signs this part needs replacing

  • Boiler fails to fire or locks out despite a call for heat
  • No heating or hot water when the thermostat or taps demand it
  • Intermittent ignition with repeated lockout cycles
  • Pump runs but the boiler does not register circulation
  • Fault code relating to water flow or no flow detected

Before you order

  • Confirm your boiler model and GC number against the fit list
  • Check the part number on the existing flow switch before removal
  • Inspect the wiring and harness connections for damage before fitting a replacement

Not sure which part?

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