Having a boiler that malfunctions and blows in frigid air, as opposed to the expected warm air, can be stressful to a homeowner just experiencing this for the first time, however, this happens many times and should be something you are used to. It is necessary to understand what could be going on with the boiler before rushing to call an HVAC professional to help… Some of the problems are easy to resolve since they only require keen eyep to fix; Four main concerns often arise when dealing with a heater, then most of these may be noticed during the annual tuneup process. First, consider checking the temperature control setting! The temperature control may be set On when it should be auto setting… Note that the fan’s setting is responsible for how the blower works and could explain the uneven air circulation! When the blower is set ON, it will run continuously without stopping, regardless of whether the boiler is working or not; Consequently, the air that gets into your apartment may be frigid since the fan still works even when the boiler does not, but it is also possible that the boiler filter is too dirty, blowing in frigid air since it has to overwork to deliver! Usually, a dirty boiler blocks air from flowing through the heat exchanger, meaning that the air getting into the house is already frigid instead of being warm as it should. To repair this, consider turning off the temperature control and checking the filter. In case it is too dirty, disinfect it or change the filter if it is disposable, another issue could be with the pilot light. Check to see that it is on since the boiler burners will not light if they are off.