The beauty of the Goodman furnace is that it is designed to self-diagnose. If the furnace has a problem, you can easily tell what the problem is by looking at the available lights. \
The blinking lights represent various codes that can be vital in the interpretation of what the problem is. We have looked at the major light codes above that you can use to interpret the issues with your Goodman furnace.The most common error code is a single red flash. The single red flash will show up, and it will stay on. This happens when your furnace is not receiving a signal from the thermostat. \
You may have a faulty thermostat, or your thermostat may not be receiving the required power. You want to check your thermostat wiring, fuse, and other aspects that could cause it to stop functioning accordingly. \