The answer to 'boiler not cooling' is that the boiler may have a problem with the circulating pump, low water levels, or a faulty thermostat. Common symptoms include the boiler running but no hot water or heat being produced. Solutions may involve checking the pump, refilling the system, or adjusting the thermostat settings.
If the boiler is not cooling properly, it's best to have a professional HVAC technician inspect and diagnose the issue. Attempting DIY repairs on a boiler can be dangerous and may cause further damage if not done correctly. A qualified technician will be able to identify the root cause and make the necessary repairs to restore proper boiler function.