How much does it cost to fix Navien error code E047?

Typical repair cost for the Navien E047 fault is £150-250 including labour.

E047 High

Navien E047 Fault Code

Q: What does the Navien E047 fault code mean?

Your boiler is struggling to accurately measure its internal water temperature, so it has stopped working as a safety precaution.

The Navien E047 fault code means: your boiler is struggling to accurately measure its internal water temperature, so it has stopped working as a safety precaution.. It appears on 7 Navien models in our database.

Technical description: Thermistor failure or inaccurate water temperatures from inside the boiler.

Typical repair cost £150-250 (including labour)

Engineer required

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

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Navien models that show the E047 fault code

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

LCB700 Repair: £150-300
NCB Repair: £150-250
NCB 28 HE Repair: £150-300
NCB 35 HE Repair: £150-300
NCB 40 HE Repair: £150-300
NCB CE Repair: £150-250
NCB H Repair: £150-300

Source

Navien E047 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