Low Information
71:0 on Viessmann Vitodens 300-W

Your boiler is notifying you that the hot water pump is running based on its set schedule, which is usually a normal operational message rather than a breakdown.

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 circulation pump: On according to DHW time program

What causes this fault?

This code is an status indicator rather than a mechanical failure, triggered when the boiler's internal clock activates the secondary hot water pump. It occurs because the system is following a pre-set schedule to ensure instant hot water is available at your taps. If you see this code when you don't need hot water, it usually means the timer settings in the control unit need to be adjusted to match your daily routine.

DIY fix possible

Check your hot water time program settings on the control panelAdjust the 'DHW circulation' schedule if the pump is running at unwanted timesReset the boiler to see if the advisory code clears

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