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vaillant ecomax 835-e we have hot water but heating does not fire up?

we operate our boiler manualy turning it on and off as we need it our hot water is working fine but our heating has refused to fire up the water pressure is ok we have replaced the batteries in the remote sender when I pushed one of the buttons a code either S30 or 530 appeared but there isn't anthing in the manual about this

garth B
April 2013

Vaillant Heating, Home Heating Systems Hot Water Fire

S30. Status code. Waiting for a heating demand. So your wireless stat isn't working.

Oops.
June 2013

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vaillant ecomax 835-e we have hot water but heating does not fire up?

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