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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
Mend Heating, Home Heating Systems
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