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Diagnosis of the fault of the air conditioning controller with which there is no communication and its operation is limited to the REST function. Registration for the training is available at: https://autonomis.pl/sklep 00:00 Introduction 00:42 Intro 01:01 Fault history 04:09 Symptom 05:41 Reading errors 09:50 Dismantling the panel and measurements on the air conditioning controller 18:30 Further diagnostic steps towards the missing CAN signal 19:28 A few words about CAN data transmission 25:05 Dismantling the counter and finding the cause of the fault 29:55 Measurement of CAN signals in the correct operating state 30:40 Reading and deleting errors after repair 32:37 Summary