Anyone tell me what the sun means on a diplomat dishwasher?

Please can anyone help I have recently bought a dippolmat dishwasher and when my kitchen fitter had finished we realised he had thrown several mannuals away, one being the one I need. Two lights recently appeared I have worked out that one was for salt but I cant get rid of the light that looks like a sun please help! It seems to work ok but god knows if I am doing damage