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One way to lower water pressure is to turn the boiler off and check that the filling loop valves are closed properly. Once this has been done, you can then allow the system to cool and begin bleeding ...

Boiler pressure is too high when the gauge dial reaches the 'red zone' (Getty) (Image: Getty) Your boiler pressure is too high when the gauge dial has gone into the 'red zone' (bar three or above) and ...