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Mend Vaillant Boiler Error Message

Valiant thermostat , BMU-Err ?

Vaillant thermostat and boiler with the error message on thermostat
What do I do?

Louise
November 2016
VaillantHeating, Home Heating SystemsBoiler Error Message
Water pressure in system too low, add water watching pressure indicator to achieve over 0.9bar.

Peter
January 2023

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