The answer to 'furnace repair not working' is that there can be several common causes, such as a malfunctioning thermostat, dirty air filters, or issues with the furnace's ignition system. Symptoms may include the furnace not turning on, blowing cold air, or making strange noises. Potential solutions can include cleaning or replacing the air filter, resetting the thermostat, or troubleshooting the ignition system.
In many cases, simple DIY troubleshooting and maintenance can resolve the issue. However, if the problem persists or you're unsure of the cause, it's best to call in a professional HVAC technician to diagnose and repair the furnace properly. They have the expertise and equipment to identify and fix more complex problems safely.