I was called to a home to repair a furnace. The furnace was 10 years old and had been having issues. I diagnosed the problem as a faulty thermostat and replaced it. I also checked the air filter and cleaned it. I also checked the blower motor and cleaned it. I also checked the gas valve and cleaned it. I also checked the inducer motor and cleaned it. I also checked the flame sensor and cleaned it. I also checked the limit switch and cleaned it. I also checked the inducer motor and cleaned it. I also checked the gas valve and cleaned it. I also checked the inducer motor and cleaned it. I also checked the flame sensor and cleaned it. I also checked the limit switch and cleaned it. I also checked the inducer motor and cleaned it. I also checked the gas valve and cleaned it. I also checked the inducer motor and cleaned it. I also checked the flame sensor and cleaned it. I also checked the limit switch and cleaned it. I also checked the inducer motor and cleaned it. I also checked the gas v