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My boiler seems to work perfectly, it reacts to the thermostat. Only, after having heated the water to 60° C, the pump always turning, the temperature goes down to 30° C. And it starts again when the water of the circuit is cold. The radiators are very hot then cold. Maybe the probe is out of order?

At the description of the facts, a faulty probe can actually be the cause of the problems. Before proceeding further, if these radiators are equipped with thermostatic valves, make sure that those in the room where the room thermostat is installed are fully open. Otherwise, the boiler can go up in temperature to reach the displayed temperature, then go down again until the room cools, and so on...

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