Low
E598 on Navien NCB 28 HE

Your boiler's internal clock has lost its settings, which usually means the system cannot keep time to manage your heating schedule correctly.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

DIY fix possible

Locate the user menu on your boiler's control panel.Navigate to the date and time settings.Manually reset the current date and time to clear the error.

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

Boiler won't turn on — 9-step checklist

Work through these before the call-out.

Read →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →