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Vaillant Wiring Harness 0020025037

Vaillant

Vaillant Wiring Harness 0020025037

Wiring harness for Vaillant EcoTEC PLUS 637 and VU 376-3-5 R1 boilers, part number 0020025037.

At a glance

  • Appliance family: EcoTEC PLUS 637 / VU 376-3-5 R1
  • Also known as 1379928
Manufacturer part no.
0020025037
Showing prices

£21.17

£17.64 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 Vaillant 0020025037 is a wiring harness used in Vaillant gas boilers. It carries electrical connections between components within the appliance, forming part of the boiler's internal wiring loom. This harness is listed for the EcoTEC PLUS 637 and VU 376-3-5 R1 models.

Signs this part needs replacing

  • Intermittent boiler operation or faults that come and go with movement of the loom
  • Error codes linked to lost or unstable electrical signals between components
  • Visible damage to the harness, such as chafed insulation, scorching or brittle wiring
  • Loose, corroded or heat-damaged connector terminals
  • Boiler failing to fire or components not receiving power

Before you order

  • Confirm your boiler model and GC number match the fitment list above
  • Check the part number on the existing harness against 0020025037
  • Inspect the connector types and harness routing on your appliance before ordering
  • If unsure of compatibility, check your model against the manufacturer's parts list

Not sure which part?

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