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Alpha Modulating Coil Spindle 6.5634390

Alpha

Alpha Modulating Coil Spindle 6.5634390

Alpha Modulating Coil Spindle 6.5634390 for compatible Alpha gas boilers; check model and GC number before ordering.

At a glance

  • Also known as MODULATING-PISTON, 1251255
Manufacturer part no.
6.5634390
GC number
343-627
Showing prices

£52.48

£43.73 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 Alpha Modulating Coil Spindle is a boiler spare part with part number 6.5634390. It is listed for Alpha gas boiler appliances and is associated with the modulating coil assembly, referenced as VR4605A. The spindle forms part of the boiler's modulation arrangement.

Signs this part needs replacing

  • Unstable burner modulation or poor flame control.
  • Boiler temperature fluctuating beyond normal operating range.
  • Hot water temperature inconsistent or difficult to regulate.
  • Boiler cycling or failing to modulate smoothly.
  • Gas valve modulation faults identified during service.

Before you order

  • Check the appliance model and GC number against the fitment list.
  • Confirm the existing part is marked with part number 6.5634390 or reference VR4605A.
  • Check whether the appliance is an LPG variant where listed.
  • If unsure, consult the manufacturer's parts list for the boiler.

Not sure which part?

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