The answer to 'when to replace troubleshooting' is that you should replace your troubleshooting process if it is no longer effective in identifying and resolving electrical issues in your home. Troubleshooting techniques may need to be updated or replaced over time as electrical systems and technologies evolve. Common signs that it's time to update your troubleshooting approach include repeated issues, longer repair times, and the inability to identify the root cause of problems.
Regularly reviewing and updating your troubleshooting process can help ensure you are using the most effective techniques for your home's electrical system. This may involve learning new diagnostic methods, investing in updated testing equipment, or consulting with a professional electrician to identify areas for improvement.