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Alpha Primary Flow Switch 1.035966

Alpha

Alpha Primary Flow Switch 1.035966

Alpha primary flow switch, part 1.035966, for PRO TEC 50 and PRO TEC PLUS 50 LPG commercial gas boilers.

At a glance

  • Appliance family: PRO TEC 50 commercial gas boilers
  • Also known as 1260004
Manufacturer part no.
1.035966
Showing prices

£148.34

£123.62 ex. VAT · VAT at 20%

Available to order · 7 working days
Available to order · 7 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 Alpha primary flow switch is a hydraulic sensing component used in PRO TEC 50 commercial gas boilers. It signals the control board that water is moving through the primary circuit, allowing the boiler to run its ignition sequence and heating demand safely. This is Alpha part number 1.035966.

Signs this part needs replacing

  • The boiler fails to fire on a heating or hot water demand despite the pump running
  • Repeated lockouts shortly after a call for heat begins
  • The pump runs continuously with no ignition and no burner modulation
  • Intermittent operation, where the boiler fires only after several demand cycles

Before you order

  • Confirm the existing flow switch is marked with part number 1.035966
  • Check the appliance model against the fit list, as only PRO TEC 50 and PRO TEC PLUS 50 are covered
  • Verify the boiler is the LPG variant, since both listed fitments are LPG
  • Inspect the wiring connections and the flow switch body for debris before condemning the part

Not sure which part?

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