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Vaillant Wiring Harness 0020181942

Vaillant

Vaillant Wiring Harness 0020181942

Wiring harness 0020181942 for Vaillant ecoTEC PRO 22 and 26 boilers, including VU 226/5-3 R2 and VUW 266/5-3 R2 variants.

At a glance

  • Also known as 1387858
Manufacturer part no.
0020181942
Showing prices

£24.64

£20.53 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 Vaillant wiring harness, part number 0020181942, is an electrical loom used on Vaillant ecoTEC PRO boilers. It carries power and control signals between the boiler's main components. It is listed for the VU 226/5-3 R2 and VUW 266/5-3 R2 variants.

Signs this part needs replacing

  • Boiler intermittently fails to fire or cuts out during operation
  • Fault codes relating to sensor, fan or control communication
  • Visible damage to the loom, such as cracked insulation or exposed conductors
  • Loose, corroded or heat-damaged connector plugs
  • Signs of chafing, rodent damage or overheating along the harness

Before you order

  • Confirm your boiler's exact model and variant (VU 226/5-3 R2 or VUW 266/5-3 R2) against the fit list.
  • These variants are listed for Guernsey and Jersey only — check this applies to your installation.
  • Compare the part number on the existing harness with 0020181942 before ordering.
  • Inspect the connectors and loom routing for damage that may require additional parts.

Not sure which part?

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