Low Information
S.13 on Vaillant ecoTEC Pro 24

Your boiler is currently trying to light the flame to provide hot water for your taps or shower.

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

DHW mode: Ignition. The ignition for domestic hot water mode is activated.

What causes this fault?

This isn't actually a fault, but a status message indicating that you have turned on a hot tap and the boiler is starting its ignition process. It occurs because the internal sensor has detected water flow and is now sparking the burner to heat that water for your shower or sink. If the code stays on screen without the water getting hot, it may suggest an issue with the gas supply or the ignition electrodes.

DIY fix possible

This fault may be fixable without an engineer. Check your manual first.

Find a Gas Safe engineer
Search the official register →

Related fault codes

S.10View →S.11View →S.14View →

Related guides you might find useful

No hot water but heating works

Almost always a stuck diverter valve on combis.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →