valliant eco plus 837 boiler ?

hot water is working but the heating will not come on

helen
November 2013

When turning on a HW tap start by pressing the 'i' button under the display, the boiler should run through the sequence s.10,11, 13 then finally s.14, also as soon as the tap is opened. The tap symbol should be in the display window. s.14 should be displayed all the time the tap is open and the flame & tap symbols should be on constantly.

Press 'i' again to return to the main display, the temperature on the boiler will steadily rise until it reaches a peak point dependant on HW selection temp, the boiler should now be modulating but the flame should remain constantly on. The CH flow pipe, should remain cold.

This would indicate 'normal operation'

I hope this helps to at least establish that your boiler is operating correctly, if it is deviating from the above, please ask here again.

Carefree
March 2011