Navien
Navien DHW Thermistor 30023765A
Navien DHW thermistor with red housing, part number 30023765A, for NCB300 and NCB500 combi boilers.
At a glance
- Part type: DHW thermistor
£5.39
£4.49 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 Navien DHW thermistor (red housing) is a temperature sensor fitted to the domestic hot water circuit of Navien combi boilers. It reports the DHW water temperature back to the boiler's control board so the appliance can regulate hot water output. This component is identified by Navien part number 30023765A.
Signs this part needs replacing
- Domestic hot water runs cold or does not reach the set temperature
- DHW temperature fluctuates or cycles during draw-off
- Boiler locks out or flags a temperature sensor fault
- DHW temperature reading at the controls is inaccurate
Before you order
- Confirm your appliance model and serial number against the fit list
- Check the housing colour and connector type on the existing thermistor
- Compare the part number marked on the existing component with 30023765A
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) | — | — | — | |
| NAVIEN NCB500-1S+/32K COMBI - (Serial Number 3924) | — | — | — | |
| NAVIEN NCB500-1S+/32K COMBI - (Serial Number 3924) | — | — | — | |
| NAVIEN NCB500-2S+/41K COMBI - (Serial Number 3712) | — | — | — | |
| NAVIEN NCB500-2S+/41K COMBI - (Serial Number 3712) | — | — | — |
Showing 10 of 12 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.
NAVIEN appliance manual — NCB300-28K COMBI - (Serial Number 3710), NCB300-37K COMBI - (Serial Number 3734), NCB300-41K COMBI - (Serial Number 3711)
manualmanualNAVIEN appliance manual — NCB500-1S+/32K COMBI - (Serial Number 3924), NCB500-2S+/41K COMBI - (Serial Number 3712), NCB500-2S/37K COMBI - (Serial Number 3735)
manualNo technical questions yet for this part.
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