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Vaillant Transformer 11-15KW 1P 0020175831

Vaillant

Vaillant Transformer 11-15KW 1P 0020175831

Vaillant transformer rated for 11-15kW single-phase Arotherm VWL 115/2 and VWL 155/2 heat pumps.

At a glance

  • Also known as 1386306
Manufacturer part no.
0020175831
Showing prices

£229.14

£190.95 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

This is a Vaillant transformer rated for 11-15kW single-phase (1P) appliances, supplied under part number 0020175831. It forms part of the electrical control assembly on Vaillant Arotherm VWL 115/2 and VWL 155/2 air source heat pumps, stepping the incoming supply down to the lower voltages used by the appliance's control circuitry. A failed transformer will typically stop the unit powering up or running through its start sequence.

Signs this part needs replacing

  • The appliance does not power up or the display stays blank
  • Repeated fuse failure on the control circuit
  • No low-voltage output at the transformer secondary
  • Visible overheating, scorching or a burning smell around the transformer
  • The heat pump fails to start or drops out during the start sequence

Before you order

  • Confirm the appliance model and variant against the fitment list above
  • Check the rating marked on the existing transformer matches 11-15kW 1P
  • Verify the part number 0020175831 on the existing component or the manufacturer's parts list
  • Isolate the electrical supply before removing or inspecting the transformer

Not sure which part?

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