Hi Shijith Search the alarm log and the test log, where the 7212 error is logged... and find the previous 2 errors... Generally the 7212 error is logged because the previous error codes, locate the codes nearest (date speaking) to the 7212 it will help to find the subsystem that generates the INOP status
when the equipment detects a software error sometimes restarts itself 3 times, after that, the ventilator stays on and then you can check the test log and the alarm log to locate the previous erros...