Boiler runs when cold water is ran

GNServices · 10 May 2014

Hello,
I have a Vaillant ECOMAX 824/2E,
When the cold water is being ran on full, the boiler turns on (sounds like the fan) and status is 17 (HW icon appears for a split second but boiler never fires up).

What could this be? It is rather annoying haha
When hot water is ran, boiler comes on as usual and fires up.
I dont know if it makes any difference but CH is depressurised.

Thanks,

diynot

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Boiler runs when cold water is ran

GNServices

DIYnot Local

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