viessmann outdoor temperature sensor

viessmann outdoor temperature sensor

viessmann outdoor temperature sensor

Hi,
Attached is a basic wiring layout of room stat + programmer working with Viessmann heat only boiler. (pic 1)

I have installed a weather compensation sensor as per schematic (pic2).

When I switch boiler on it shows the display with temperature and CH symbol but it is not igniting.

Is there wiring that I need to change; the room stat clicks, I have put it to 30C but boiler is not firing.

How do I bypass the room stat?
Thanks.

by desktop987456

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