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Vaillant Microswitch 126246

Vaillant

Vaillant Microswitch 126246

At a glance

  • Part type: Microswitch
  • Also known as 1373667
Manufacturer part no.
126246
GC number
283-518
Showing prices

£8.88

£7.40 ex. VAT · VAT at 20%

In stock
Cut-off passed — dispatches next working day
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Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Vaillant 126246 is a microswitch used in Vaillant THERMOcompact VU and VU series boilers. It is a small electro-mechanical switch that closes or opens a contact when a moving part of the boiler reaches a set position, feeding that signal back to the control circuit. It is a serviceable spare, listed by Vaillant under part number 126246.

Signs this part needs replacing

  • The boiler does not respond when there is a call for heat, with no ignition sequence starting.
  • The appliance fires intermittently, cutting out and restarting without an obvious pattern.
  • The fan, pump or other switched component fails to run when the boiler is asked to start.
  • A fault code or lockout appears that points to a switch or position-sensing circuit.
  • The switch lever or plunger shows physical wear, sticking or a weak return action.

Before you order

  • Check the GC number and model on the appliance data badge against the compatibility list before ordering.
  • Confirm the part number 126246 on the existing switch, as Vaillant used more than one switch type across the VU range.
  • Note that this part is listed as superseded to KHO018670; check which number is fitted to your appliance.

Not sure which part?

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