Ideal
Ideal Air Pressure Switch Classic NF IDEAL137990
Ideal 137990 air pressure switch for Classic NF and Elan 2 NF gas appliances, proving fan airflow before ignition.
At a glance
- Appliance family: Classic NF, Classic Combi NF, Elan 2 NF
- Also known as 1176593, IDEAL137990
£123.78
£103.15 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 137990 is an air pressure switch used on Ideal Classic NF and Elan 2 NF appliances. It monitors the pressure produced by the fan and confirms that air is moving through the combustion circuit before the appliance is allowed to fire. When the switch does not make, the appliance will not proceed to ignition and will typically lock out.
Signs this part needs replacing
- The appliance locks out shortly after the fan starts, with no ignition attempt.
- The fan runs continuously but the burner never lights.
- Repeated lockouts that clear on reset and then return.
- Intermittent operation, particularly in cold or windy conditions where flue pressure varies.
- A fault code or lockout pattern consistent with an air pressure proving failure.
Before you order
- Confirm the appliance model and GC number against the compatibility list above before ordering.
- Check the existing switch part number on the component or in the appliance documentation.
Mechanical
| Part type | Air pressure switch |
|---|---|
| Appliance family | Classic NF, Classic Combi NF, Elan 2 NF |
Compliance
| Manufacturer part number (MPN) | 137990 |
|---|---|
| GC number | 379-235 |
| Commodity code | 9032 20 00 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Alternative numbers | 5022141379901, IDEAL137990, IDEAL137990, IDEAL137990, 1176593 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| IDEAL CLASSIC COMBI NF80 | 47-415-07 | 47-415-07 | — | — |
| IDEAL CLASSIC NF 30 | 41-429-30 | 41-429-30 | — | — |
| IDEAL CLASSIC NF 40 | 41-429-31 | 41-429-31 | — | — |
| IDEAL CLASSIC NF 50 | 41-429-32 | 41-429-32 | — | — |
| IDEAL CLASSIC NF 60 | 41-429-33 | 41-429-33 | — | — |
| IDEAL CLASSIC NF 70 | 41-429-77 | 41-429-77 | — | — |
| IDEAL CLASSIC NF 80 | 41-429-34 | 41-429-34 | — | — |
| IDEAL CLASSIC NFP 50 | — | — | — | |
| IDEAL CLASSIC NFP 60 | — | — | — | |
| IDEAL CLASSIC NFP 80 | — | — | — |
Showing 10 of 15 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 COMBI NF80 (GC 47-415-07)
manualmanualIDEAL appliance manual — CLASSIC NF 30 (GC 41-429-30), CLASSIC NF 40 (GC 41-429-31), CLASSIC NF 50 (GC 41-429-32), CLASSIC NF 60 (GC 41-429-33), CLASSIC NF 70 (GC 41-429-77), CLASSIC NF 80 (GC 41-429-34)
manualmanualIDEAL appliance manual — CLASSIC NFP 50, CLASSIC NFP 60, CLASSIC NFP 80
manualmanualIDEAL appliance manual — ELAN 2 NF230 (GC 41-429-60), ELAN 2 NF240 (GC 41-429-61), ELAN 2 NF250 (GC 41-429-62), ELAN 2 NF260 (GC 41-429-63), ELAN 2 NF280 (GC 41-429-64)
manualNo 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.