Ideal
Ideal Air Pressure Switch Classic HE 174064
Ideal air pressure switch, part 174064, for Classic HE and Optia boilers; proves fan operation before the boiler is allowed to fire.
At a glance
- Part type: Air pressure switch
- Also known as 1179795
£148.98
£124.15 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 Ideal air pressure switch, part 174064, is a safety device fitted to Classic HE and Optia boilers. It confirms that the combustion fan is running and shifting air before the appliance is permitted to fire, and the boiler's printed circuit board monitors the switch continuously. If the fan stops or the pressure signal is lost, the switch holds the boiler back so flue products cannot accumulate without a route to atmosphere.
Signs this part needs replacing
- The boiler locks out on a call for heat, often shortly after the fan starts
- The fan runs but the burner never lights
- Intermittent lockouts that clear on reset and then return
- Repeated fault codes pointing to an air pressure or fan problem
- The appliance will not fire from cold but runs normally once restarted
Before you order
- Check the GC number on the appliance data badge against the compatibility list below
- Confirm the exact model, as Classic HE and Optia variants differ in layout and connections
- Inspect the fan, sensing tubes and pressure ports first, since blockages can imitate a switch fault
Mechanical
| Part type | Air pressure switch |
|---|
Compliance
| Manufacturer part number (MPN) | 174064 |
|---|---|
| GC number | H29-149 |
| Barcode / EAN | 5022141740640 |
| Commodity code | 9032 20 00 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Alternative numbers | 1179795 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| IDEAL CLASSIC HE 12 | 41-415-59 | 41-415-59 | — | — |
| IDEAL CLASSIC HE 15 | 41-421-45 | 41-421-45 | — | — |
| IDEAL CLASSIC HE 15P | 41-421-97 | 41-421-97 | — | — |
| IDEAL CLASSIC HE 18 | 41-421-46 | 41-421-46 | — | — |
| IDEAL CLASSIC HE 18P | 41-421-98 | 41-421-98 | — | — |
| IDEAL CLASSIC HE 9 | 41-415-58 | 41-415-58 | — | — |
| IDEAL IDEAL : CLASSIC HE12 | — | — | — | |
| IDEAL IDEAL : CLASSIC HE15 | — | — | — | |
| IDEAL IDEAL : CLASSIC HE18 | — | — | — | |
| IDEAL IDEAL : CLASSIC HE9 | — | — | — |
Showing 10 of 19 compatible appliances.
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.
IDEAL appliance manual — CLASSIC HE 12 (GC 41-415-59), CLASSIC HE 15 (GC 41-421-45), CLASSIC HE 15P (GC 41-421-97), CLASSIC HE 18 (GC 41-421-46), CLASSIC HE 18P (GC 41-421-98), CLASSIC HE 9 (GC 41-415-58)
manualmanualIDEAL appliance manual — OPTIA HE 12 (GC 41-421-71), OPTIA HE 15 (GC 41-421-72), OPTIA HE 18 (GC 41-421-96), OPTIA HE 9 (GC 41-421-70)
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