Can the property management company in the community use individuals with elevator installation and maintenance operation certificates instead of elevator engineering companies?

Yes! It can also prevent the elevator engineering company from tampering: the management office sends the elevator inverter outside for maintenance.

Most elevator maintenance companies do not cover inverter maintenance. The elevator frequency converter is broken, which is a good opportunity for the maintenance company to earn some "income", and the maintenance premium will definitely be higher! Some management offices are too smart to send the inverter to me for repair, which makes the maintenance company very unhappy. They just fiddle with the elevator control circuit or inverter parameters, so that your elevator can't be transported normally, and then say that something is broken, so they have to charge more anyway. This often happens, so when the inverter is determined to be broken, either don't let the maintenance company know and send it to the maintenance company, or let the maintenance company send it, so that you can earn some labor costs, otherwise it may not be worth the loss! Have a headache for a few days!