What do I have to do in order to check for possible leakages in my home installation?

The basic check you can do to detect leaks is to leave the stopcock open and not use any element or equipment susceptible to consumption, having made sure that if you have a deposit, it is full. If under these circumstances the water meter registers a water flow, it is caused by an involuntary consumption in a point of the home network, tap or cistern. It should be located and repaired without delay. However minor they may seem, it would have an impact on your invoice.