With my V70 the heater can no longer be activated, neither directly nor by timer. In the spring everything worked fine. In one of my first attempts this autumn was at least the ventilation on and also the AI showed what, but the heater itself did not work. I thought it would come from the temperatures around 10° but today I found that it can not be started directly. The only thing I have exchanged since the spring is the combi-instru ment. So I wonder if there is any connection? The timer and the direct start function for the preheater are displayed correctly. If you could exclude the connection, then what can it be?