Navien
Navien Cover PCB 20057711A
Protective cover PCB for Navien NCB300 and NCB500 combi boilers, part number 20057711A.
£5.75
£4.79 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 Cover PCB is a Navien component supplied for the NCB300 and NCB500 combi boiler families. It forms the protective cover over the printed circuit board area, shielding the board from dust, moisture and accidental contact. It is identified by Navien part number 20057711A.
Signs this part needs replacing
- Visible cracks, splits or deformation in the cover
- Broken or missing securing tabs and clips so the cover will not seat
- Damp, staining or corrosion marks on the cover surface
- Cover removed and not refitted, leaving the PCB exposed
- Loose cover that no longer sits flush over the board
Before you order
- Confirm your boiler model against the fitment list above
- Check the serial number of your appliance matches the listed range
- Compare the part number on the existing cover with 20057711A
- Inspect the PCB and its fixings while the cover is off, as further parts may be needed
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.
Not sure which part?
Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.