Please help if possible. This heater is in my son's rental flat. He has both wall switches on. He has kept the convector dial to 0 on the top left. The two switches on top right of the heater, with one and two dots respectively, are switched down towards the dots. It has been left for over a week like this to no effect. What are we doing wrong? Could it be that it needs a manual re set inside and if so, is it easy to get the cover off?
Should both wall switches (one fused, one not) be on? He has economy 7.