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Main Air Pressure Switch 5110393

Main

Main Air Pressure Switch 5110393

Air pressure switch, part number 5110393, for selected Main and Potterton HE boilers.

At a glance

  • Also known as 1123699
Manufacturer part no.
5110393
GC number
H26-817
Showing prices

£51.11

£42.59 ex. VAT · VAT at 20%

Available to order · 1 working day
Available to order · 1 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 5110393 air pressure switch is a safety component used on Main and Potterton HE condensing boilers. It monitors the pressure produced by the combustion fan and proves airflow before the boiler is allowed to fire. The switch carries the Huba reference 605.99689.

Signs this part needs replacing

  • The fan runs but the boiler will not fire or light.
  • The boiler locks out repeatedly, often shortly after the fan starts.
  • Ignition is intermittent, with the boiler running correctly on some attempts and failing on others.
  • The boiler fails to reach or hold its ignition sequence and shuts down before flame is established.
  • Fault codes or lockout indications relating to air pressure or fan proving appear on the appliance.

Before you order

  • Confirm your appliance model matches one of the fitments listed above.
  • Check the existing switch on the boiler and compare its part number and Huba reference against 5110393 and 605.99689.
  • Verify the fan is running and the pressure sensing tubes are clear and correctly connected before assuming the switch is at fault.
  • Check the appliance's own data badge and parts list to confirm the correct component for your variant.

Not sure which part?

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