Responded to no-heat service call for furnace with intermittent ignition failure displaying "LO" error code. Diagnosed faulty gas valve failing to open despite receiving proper power signal. Temporarily restored operation through manual intervention, but observed severely rusted burners contributing to flame dropout issues. Performed visual heat exchanger inspection with no visible compromises detected. Recommended replacement of gas valve and burners along with complete system tune-up as permanent solution. Customer informed about high probability of recurring failure and discussed equipment replacement options.
