High
E351 on Navien NCB CE

Your boiler is struggling to understand how much water is inside it, so it has stopped working to prevent any potential damage.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

E352View →E353View →

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