Some types of cabin sensors are sensitive to air movement, so the alarm may sound when the heater is running. These are so-called ultrasonic sensors that look like small microphones. Most often, such a problem occurs with additional alarms, but it does not occur very often. In any case, it is important to consider these risks, because solving the problem of alarm activation is not included in the price of installing the heater. It is always an additional service for which you have to pay separately. This problem can be easily solved by turning off the cabin sensors when you intend to use the heater. If there is no such function, the sensitivity of the sensors or the speed of the cabin fan can be reduced to reduce the air movement in the cabin. If it is an additional alarm and none of the proposed methods help, the solution is either to replace the sensor with another one that is suitable for working with the heater, or to completely remove the sensor.