The answer to 'heat pump not working' is that there are several common causes, including a refrigerant leak, faulty compressor, issues with the thermostat, or problems with the electrical system. Symptoms may include the heat pump not turning on, blowing cold air when it should be heating, or making strange noises. Solutions can range from simple DIY fixes like replacing the air filter or resetting the thermostat to more complex repairs that require a professional HVAC technician.
If the heat pump is not working at all, it's best to call a professional to diagnose and repair the issue. Trying to fix the heat pump yourself without the proper training and equipment can be dangerous and may end up causing more damage. A qualified HVAC technician will be able to quickly identify the problem and get your heat pump back up and running safely.