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Ariston Wiring Air Pressure Switch/Probe 999425

Ariston

Ariston Wiring Air Pressure Switch/Probe 999425

Wiring for the air pressure switch or probe on Ariston gas boilers, including Excalibur, Microcombi and Microtec models.

At a glance

  • Part type: wiring for air pressure switch/probe
  • Also known as WIRING-AIR-PRESSURE-SWITCHPROBE, 1577580
Manufacturer part no.
999425
Showing prices

£12.01

£10.01 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

This is the wiring lead for the air pressure switch or probe used on Ariston gas boilers. It carries the signal between the air pressure switch/probe and the boiler's control circuit, allowing the appliance to prove fan and flue operation before ignition. It is supplied as an Ariston spare under part number 999425.

Signs this part needs replacing

  • Boiler goes to lockout with the fan running but no ignition sequence
  • Intermittent lockouts that clear on reset, particularly on start-up
  • Brittle, cracked or heat-damaged insulation on the lead
  • Loose or corroded terminals at the switch/probe or board end
  • Continuity faults or an open circuit on the lead when tested

Before you order

  • Confirm your boiler model and edition against the fit list above
  • Check the connector type and lead routing on the existing part match this lead
  • Confirm whether your appliance uses an air pressure switch or a probe connection

Not sure which part?

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