The answer to 'system upgrade not working' is that there could be several common causes, such as improper installation, compatibility issues, or a problem with the new equipment. Symptoms may include the system not powering on, strange noises, or poor performance. Solutions can range from simple troubleshooting to full system replacement, depending on the issue.
If you're experiencing problems with a recent HVAC system upgrade, it's best to call a professional HVAC technician to diagnose and resolve the issue. Attempting DIY repairs on a new system could potentially make the problem worse or even create safety hazards. A qualified technician will have the expertise to identify the root cause and make the necessary repairs or adjustments to get your upgraded system working properly.