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Saunier Duval Microswitch Assembly 05159000

Saunier Duval

Saunier Duval Microswitch Assembly 05159000

Microswitch assembly for Saunier Duval gas boilers, including Thelia, Themis and Combitek models.

At a glance

  • Also known as 1414781
Manufacturer part no.
05159000
Showing prices

£27.50

£22.92 ex. VAT · VAT at 20%

In stock
Cut-off passed — dispatches next working day
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 microswitch assembly is a Saunier Duval electrical component used in a range of gas boilers across the Thelia, Themis and Combitek families. It actuates in response to a mechanical input such as a pressure or flow signal, closing or opening a circuit to allow the boiler to respond to a demand. It is supplied under part number 05159000.

Signs this part needs replacing

  • Boiler does not fire on a heating or hot water demand
  • Intermittent operation, with the boiler responding only some of the time
  • No switching action when the actuator is depressed or released
  • Audible click from the switch without the boiler igniting
  • Boiler locks out or drops out shortly after starting

Before you order

  • Confirm your appliance model against the fit list above, noting whether it is a CE or pre-CE variant
  • Check the part number on the existing component matches 05159000
  • Inspect the switch body and terminals for damage, corrosion or loose connections before ordering
  • If in doubt, have a qualified heating engineer confirm the diagnosis and correct part

Not sure which part?

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