The answer to 'boiler not cooling' is that the most common causes are a malfunctioning thermostat, low coolant levels, or a problem with the boiler's compressor or fan. Symptoms may include the boiler running continuously without cooling the home, warm air blowing from vents, or the boiler freezing up. Solutions can include replacing the thermostat, recharging the coolant, or getting the compressor or fan repaired.
If the boiler is not cooling properly, it's best to have a professional HVAC technician diagnose and repair the issue. Attempting DIY repairs on a boiler can be dangerous and may void the warranty. A qualified technician can quickly identify the problem and make the necessary repairs to restore proper cooling.