I have moved in 3 days to a flat which seems to have a lot of problems. I have not had hot water yet and the agent tells me I will pay for a call-out if it will be something simple and I could have found it on the internet.. So I am paranoid. The red light is on. I usually would have a shower around 1 am but there was never hot water in the bathroom or kitchen regardless of the time. I also found next to the water container that all switches were on but the isolator switch was off. Is that correct and is that a reason why it doesn't work. I read other articles but nothing works.