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Vaillant Control Box 0020231120

Vaillant

Vaillant Control Box 0020231120

Vaillant control box, part 0020231120, for HOME Combi 25 -A, 30 -A and 35 -A gas boilers.

At a glance

  • Appliance family: HOME Combi -A
  • Also known as 1388166
  • Arrange fitting by a Gas Safe registered engineer where the casing or gas-carrying parts must be disturbed
Manufacturer part no.
0020231120
Showing prices

£34.57

£28.81 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 CONTROL BOX is a control component for the Vaillant HOME Combi range of gas boilers. It forms part of the appliance's control assembly, handling the signals that govern boiler operation and user controls. It is supplied as the control box only, part number 0020231120.

Signs this part needs replacing

  • The boiler controls are unresponsive, with no response to button or dial input
  • The appliance fails to power up or loses power intermittently
  • The boiler will not respond to a call for heating or hot water
  • Repeated lockouts or fault indications traced to the control assembly
  • Visible damage, moisture ingress or burning at the control box

Before you order

  • Confirm the appliance model and GC number match the fit list above
  • Check the existing control box part number against 0020231120
  • Isolate the electrical supply before inspection or replacement
  • Arrange fitting by a Gas Safe registered engineer where the casing or gas-carrying parts must be disturbed

Not sure which part?

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