The answer to 'boiler blowing hot air' is that there are several common causes, including a faulty thermostat, blocked air vents, low water pressure, or a problem with the boiler itself. Symptoms may include the boiler running constantly, uneven heating, or the boiler making strange noises.
Some potential solutions include checking the thermostat settings, ensuring air vents are clear, and verifying the water pressure. However, if the issue persists or you're unsure of the cause, it's best to call a professional HVAC technician to diagnose and repair the problem.