Error code

Hey community, I read out some mistakes today. Has a lot come together. Some I can delete after all two problems. CEM-1E05 communication with the CPM control unit. (think about plug-in connection or cable break) It also gets very slowly warm. Think only by engine so that the heater does not start at all. Maybe someone already had the same. And the second is not quite so wild… PHM-000C handset hook signal is missing. So freephone system i.e. however if I have the listener (Contact error???) As always highly pleased for qualified information including construction/repair instructions. Greeting Stumpanski