E352 High

Navien E352 Fault Code

The Navien E352 fault code means: your boiler is currently unable to read its own internal water pressure, which prevents it from operating safely to provide heat or hot water.. It appears on 7 Navien models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Water Pressure Sensor: Unable to detect or measure changes of water pressure
Typical repair cost £150-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Navien models that show the E352 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Navien E352 fault code information on this page is sourced and cross-checked against the official Navien service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026