Recent content by scappi3

Hi thanks for the reply. I have tried that and the same thing happens. We have never had the Water tank switched on, we got this feature to 'future proof' the house for when my children grow up.

Hello, I have a vaillant 937 which is about 4 years old, but has now developed a problem. When running a bath the boiler switches on and the temperature on the lcd screen goes up to about 80 and stays there for a few seconds and the goes down to 45 (which means the hot water is now nearly...