I have just moved into a house with a Water Furnace Envision model NDV049A111CTL and have noticed that it keeps running on AUX due to a code 6/open start circuit error per the CA board. I have flipped the breakers several times and the system will start up fine but after about 5-10 minutes, it will kick over to AUX again and start flashing codes. I don't yet know what kind of loop it is on. The outside temps are hitting a low of the mid 40s here in Maryland Was put in by Total Comfort. Probably 3 years ago or so. I have not gone anywhere else yet as I am looking to get better educated with how I can troubleshoot this and not sound like a moron when I call the service guy. Thanks in advance and please let me know if there is more info needed to diagnose!