Navien
Navien Printed Circuit Board 30021890C
Printed circuit board for Navien LCB 700 Regular Internal and External boilers.
At a glance
- Part type: printed circuit board
- Appliance family: LCB 700 Regular
£167.88
£139.90 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 LCB 700 Regular boilers. It manages ignition, firing sequence, temperature regulation and safety monitoring across the appliance. This board is listed for both internal and external LCB 700 Regular models.
Signs this part needs replacing
- Boiler fails to fire or runs through the start-up sequence without igniting
- No display, blank panel or unresponsive controls
- Repeated fault codes or lockouts that clear only temporarily
- Erratic fan, pump or burner behaviour not explained by other components
- Board shows signs of heat damage, moisture ingress or burnt tracks
Before you order
- Confirm your appliance is an LCB 700 Regular, not another Navien range
- Check whether your boiler is the internal or external variant
- Match the output rating (21KW, 28KW or 36KW) to your appliance
- Compare the part number printed on the existing board with 30021890C
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| NAVIEN LCB 700 REGULAR EXTERNAL 21KW (Serial Number 1474) | — | — | — | |
| NAVIEN LCB 700 REGULAR EXTERNAL 21KW (Serial Number 1474) | — | — | — | |
| NAVIEN LCB 700 REGULAR EXTERNAL 28KW (Serial Number 1478) | — | — | — | |
| NAVIEN LCB 700 REGULAR EXTERNAL 28KW (Serial Number 1478) | — | — | — | |
| NAVIEN LCB 700 REGULAR EXTERNAL 36KW (Serial Number 1482) | — | — | — | |
| NAVIEN LCB 700 REGULAR EXTERNAL 36KW (Serial Number 1482) | — | — | — | |
| NAVIEN LCB 700 REGULAR INTERNAL 21KW (Serial Number 1472) | — | — | — | |
| NAVIEN LCB 700 REGULAR INTERNAL 21KW (Serial Number 1472) | — | — | — | |
| NAVIEN LCB 700 REGULAR INTERNAL 28KW (Serial Number 1477) | — | — | — | |
| NAVIEN LCB 700 REGULAR INTERNAL 28KW (Serial Number 1477) | — | — | — |
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.
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