Navien
Navien Printed Circuit Board 30029600A
Printed circuit board for Navien NCB300 combi boilers, controlling ignition, modulation and safety functions.
At a glance
- Part type: printed circuit board
- Appliance family: NCB300 combi
£109.39
£91.16 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 printed circuit board is the main control board used in Navien NCB300 combi boilers. It manages ignition, burner modulation, pump and fan operation, and the boiler's safety interlocks. The board also handles communication with the room thermostat, controls and any connected accessories.
Signs this part needs replacing
- The boiler has no power or the display stays blank when the supply is confirmed live
- The boiler locks out repeatedly or will not attempt an ignition sequence
- Error or fault codes appear that clear only temporarily after a reset
- The fan, pump or diverter no longer respond to demand from the controls
- Controls and thermostat inputs are ignored, or the boiler runs erratically
Before you order
- Confirm the boiler model is an NCB300 combi in 28K, 37K or 41K output
- Check the part number printed on the existing board against 30029600A
- Inspect the wiring harness, fuses and plug connections before condemning the board
- Verify the appliance serial number against the model listing for your boiler
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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