Hi my Viessmann 100 boiler when the wall remote control is turned to off the boiler will still come on and heat up the radiators even though it’s 19 degrees in the property it comes on for about twenty minutes and when it’s on the red hot water and red heating light on the signal receiver are on that’s normal but the strange thing is a yellow light constantly flashes next to them on the signal receiver and I can’t find out what that means and how to stop it firing up when ever it wants. The only way at the moment is to turn the heating off. Any advice would be appreciated.Thank You.
