Navien
Navien Heating Flow Switch 30014860A
Heating flow switch for Navien NCB300 combi boilers, used to detect water flow through the heating circuit.
At a glance
- Part type: heating flow switch
- Appliance family: NCB300 combi
£10.39
£8.66 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 heating flow switch is a Navien component fitted to NCB300 series combi boilers. It detects water flow through the heating circuit and signals the boiler's control system so that burner operation and circulation are matched to demand. It is a serviceable part within the boiler's hydraulic assembly.
Signs this part needs replacing
- Boiler fails to fire when there is a call for heating
- Heating demand is not recognised, so the pump runs without ignition
- Intermittent heating operation that cuts in and out without a clear pattern
- Flow-related fault codes or lockouts appearing on the boiler display
- Heating circuit behaves normally at the radiators but the boiler does not respond
Before you order
- Confirm the boiler model is an NCB300 combi and matches one of the fitments listed
- Check the serial number against the appliance data badge to confirm the correct variant
- Verify the existing flow switch part number before ordering
- Inspect the wiring connections and hydraulic housing for damage or debris before fitting
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| NAVIEN NCB300-28K COMBI - (Serial Number 3710) | — | — | — | |
| NAVIEN NCB300-28K COMBI - (Serial Number 3710) | — | — | — | |
| NAVIEN NCB300-37K COMBI - (Serial Number 3734) | — | — | — | |
| NAVIEN NCB300-37K COMBI - (Serial Number 3734) | — | — | — | |
| NAVIEN NCB300-41K COMBI - (Serial Number 3711) | — | — | — | |
| NAVIEN NCB300-41K COMBI - (Serial Number 3711) | — | — | — |
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.
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