Low
S.74 on Viessmann Vitodens 222-F B2TF

Your boiler is temporarily pausing the central heating because it is prioritising heating up your hot water tank.

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.

What the manual says

Manufacturer manual

Heating suppression; heating DHW circulation pump active

From this model's manual
Verified against the Viessmann Vitodens 222 F B2tf installation & service manual, page 110.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Wait up to 30 minutes for the hot water tank to reach its set temperatureCheck your hot water temperature settings to ensure they aren't set unnecessarily highMonitor the boiler display to see if the code clears once the tap symbol stops flashing

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