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Mend Vaillant Ecomax 824 Fault Code Low Pressure

Where is the water switch- Vailant Ecomax 824-Fault code F25?

My Vailant Ecomax is showing a fault code of F25 (water switch - low pressure) I have checked the pressure which looks fine but I cannot identify the water switch, where is it or does it have another name?

Trevor
November 2010

Vaillant Vaillant Ecomax 824 Heating, Home Heating Systems Vaillant Fault Code Low Pressure

Top left on the pipework going to the main heat exchanger, it's round and black with a yellow face and has two wires attached.

Carefree
November 2010

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Vaillant Ecomax 824 F25 Fault - Water Switch Location