Phaeton3.0 TDI from 2012 – Auxiliary heating works sporadic

Hello together My problem: Since last winter my auxiliary heating spins and goes over the remote control only sporadically and also after a short time again. I searched here in the forum already and did the following: – New battery remote control – All fuses under the steering wheel and in the trunk checked. Unfortunately there is no more occupancy schedule so I have all looked through now I have read that you can burn the auxiliary heating free by VCD in maintenance mode. D he question would be whether someone in the Neckar district of the Rhine can do that? Or does anyone else have an idea before I run to the friendly one?