BoilerFaultCodes E02
Pressure is lower than the minimum pressure set
Navien NCB-33LHWE Fault codes & diagnostics
1 fault code with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Gas 2014-present
GC Number 41-709-04
Download the Navien NCB-33LHWE manual
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Versions & GC numbers
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Which version do you have?
The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 41-709-04 | NCB-33LHWE | 2014–present |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
Fault codes
All 1 documented codes
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