DHW pre-heat function Low

Vokera DHW pre-heat function Fault Code

Also written as DHWPREHEATFUNCTION — same fault.

The Vokera DHW pre-heat function fault code means: your boiler is currently set to keep its internal water store warm for faster hot water delivery, but this is a settings preference rather than a breakdown.. It appears on 1 Vokera 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: None

DIY fix possible

Locate the domestic hot water (DHW) pre-heat button or dial on the front control panel.Press the button or adjust the dial to switch the pre-heat function to the 'Off' position.Monitor the boiler display to ensure the indicator light for pre-heat has deactivated.

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Vokera models that show the DHW pre-heat function fault code

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

Source

Vokera DHW pre-heat function fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026