If you are experiencing problems with your intercom, and others are too, it is likely to be a communal fault. However, if the problem is only related to your intercom unit, then it is likely to be an isolated (non-communal) problem.
We can arrange for one of our engineers to attend and inspect the unit should it be the case that the communal intercom unit is not work then again this would be the responsibility of the management company. However, if the problem is not communal, then either your lettings agent or you would be responsible for the call-out costs of the engineer and any quote to fix the problem. We will require an indemnity to be undertaken by you before sending an engineer to investigate.