E598 Low

Navien E598 Fault Code

The Navien E598 fault code means: your boiler's internal clock has lost its settings, which is likely preventing the system from running on its programmed schedule.. It appears on 1 Navien model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Abnormal operation: Panel real time clock
Typical repair cost £120-200 (including labour)

DIY fix possible

Check the time and date settings on the boiler control panelManually reset the clock to the current timePress the reset button to clear the fault codeCheck if the scheduled timer programs need to be re-entered

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Navien models that show the E598 fault code

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

Source

Navien E598 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 7 July 2026