I have a LGA120HH2y giving me an error code 4. Which is A17 input indicates smoke alarm. I located both return and supply air smoke alarms. Both checked out ok and are showing me green led as their manual states. I was looking to see if their is anyway to bypass the smoke alarm in the units programming. I tried unplugging their molex plugs but still recieve the error code. I'm going to test the smokes with the magnet but am at a loss right now. Any input is always appreciated.