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low pressure on vaillant boiler?

The pressure is very low on my boiler, I've tried to fill it up by turing the water valve on the bottom of the boiler to line up with the pipe. But the pressure does not change. Whats wrong?

maire_diver
February 2007

Vaillant Heating, Home Heating Systems Pressure Heating Vaillant

pressure senser has failed...needs replacing.

THE GAS MAN
February 2007

pressure senser has failed, needs replacing.....

THE GAS MAN
February 2007

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Vaillant Boiler Low Pressure - Fixes & Help