Furnace Stopped Working

This guide provides a comprehensive approach to troubleshooting a stopped furnace, emphasizing immediate safety and structured problem-solving. It begins with critical safety checks, including shutting off power, ventilating if gas is smelled, and verifying carbon monoxide detectors are functional. Homeowners are then advised to gather essential tools like a flashlight and multimeter, and record system information such as make, model, and any error codes to assist technicians. The guide systematically addresses common issues, starting with verifying the power supply by checking main breakers, furnace switches, and thermostat batteries, which are frequently overlooked culprits. It then details inspecting thermostat settings for correct mode and temperature, and how to perform resets. Further steps involve checking fuel and ignition, including gas supply, pilot lights, and electronic ignition error codes, stressing the danger of DIY with gas. Airflow and filters are evaluated as common causes of system shutdowns due to blockages. Finally, the guide covers testing internal safety switches like limit switches, flame sensors, pressure switches, and condensate lines. The content concludes with a strong emphasis on when to call a professional technician for persistent issues, gas odors, or critical errors, and highlights the importance of preventative maintenance, including regular filter changes and annual professional tune-ups, to ensure long-term safety and system reliability. Heater Not Working No Heat Repair Furnace Stopped Working