Main
Main Air Pressure Switch 5112196
Air pressure switch for Main and Potterton HE gas boilers, manufacturer part number 5112196.
At a glance
- Part type: air pressure switch
- Also known as 1123739
£47.46
£39.55 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The air pressure switch is a safety device used on Main and Potterton HE gas boilers. It monitors the pressure produced by the combustion fan and confirms that air is moving through the appliance before the gas valve is allowed to open. This unit carries the manufacturer part number 5112196 and the HUBA reference 605.99685.
Signs this part needs replacing
- The boiler locks out after the fan starts, with no ignition sequence following.
- Repeated lockouts on start-up that clear only after a reset.
- The fan runs but the boiler fails to prove air pressure and will not fire.
- Intermittent lockouts that become more frequent over time.
- A fault code or lockout pattern consistent with an air pressure or fan proving fault.
Before you order
- Confirm the appliance model against the fit list above.
- Check the existing switch for the part number 5112196 and the HUBA reference 605.99685.
- Inspect the sensing tubes and fan for blockages or damage before replacing the switch, as these can produce the same symptoms.
- Confirm the boiler is isolated from the electrical supply before any work is carried out.
Compliance
| GC number | H26-813 |
|---|---|
| Barcode / EAN | 5039177655497 |
| Alternative numbers | 1123739 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| MAIN MAIN HEATING ONLY 12 HE | 41-474-02 | 41-474-02 | — | — |
| POTTERTON PERFORMA HE 12 SL | 41-592-06 | 41-592-06 | — | — |
| POTTERTON SUPRIMA 40 HE | 41-075-36 | 41-075-36 | — | — |
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
No technical questions yet for this part.
Not sure which part?
Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.