The answer to 'furnace repair not working' is that there can be several common causes, including a faulty thermostat, clogged air filters, issues with the pilot light or ignition system, or problems with the furnace's blower motor or heat exchanger. Symptoms may include the furnace not turning on, not producing heat, or cycling on and off frequently.
If the furnace is not working, the first step is to check basic troubleshooting items like the thermostat settings, air filters, and pilot light. Many minor furnace issues can be resolved with DIY repairs. However, if the problem persists or you suspect a more serious issue, it's best to call in a professional HVAC technician to diagnose and repair the furnace properly and safely.