I have a vaillant ecoTEC Plus 837 boiler that is almost 3 years old. This is controlled by a salus wifi controller (I know that these are not great). The problem is at at will, the boiler turns itself on and off. I have removed the batteries from the controller so it is having no effect. The wifi receiver LED next to the boiler shows green when the boiler is on. Could a spurious wifi signal be triggering it or, is it a fault with the boiler?

Any suggestions would be gratefully received.

Thanks

Graham, April 2014

Did not come cross problem like this look like faulty control ,boiler only work when is call for ,dis connect wire link from PCB replace with loop as before ,see boiler works with timer than you know that fault is control ,replace with new one may be Honeywell.

ltd, April 2014