Navien
Navien Backup Seal 20051656A
Backup seal for Navien LCB 700 combi, regular and system boilers.
At a glance
- Part type: Backup seal
- Appliance family: Navien LCB 700
£4.08
£3.40 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 backup seal is a sealing component for the Navien LCB 700 boiler range. It is listed under part number 20051656A and is used to maintain a watertight joint within the appliance. This part is suitable for LCB 700 combi, regular and system models.
Signs this part needs replacing
- Visible cracking, swelling or deformation of the seal
- Water weeping or dripping from the seal area
- Loss of system pressure
- Discolouration or hardening of the seal material
Before you order
- Check the boiler model and serial number against the fitment list
- Confirm the part number 20051656A matches your existing component
- Inspect the seal seating area for damage or debris before fitting
- Verify that no other seals or gaskets in the same assembly require replacement
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| NAVIEN LCB 700 COMBI EXTERNAL 21KW (Serial Number 1705) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 21KW (Serial Number 1705) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 28KW (Serial Number 1710) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 28KW (Serial Number 1710) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 36KW (Serial Number 1709) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 36KW (Serial Number 1709) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 21KW (Serial Number 1704) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 21KW (Serial Number 1704) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 28KW (Serial Number 1706) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 28KW (Serial Number 1706) | — | — | — |
Showing 10 of 36 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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