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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

home Fix label Heating label_important Home Heating Systems category Vaillantdone

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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home Fix label Heating label_important Home Heating Systems category Vaillant

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

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

I can answer this question ...

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

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