System does not have to be reset after replacing the batteries. I need to get a meter or an electrical guy to help you troubleshoot the charger part of the inverter. I have the same magnum 2000 inverter charger but I do not know the effect without the temperature sensor. I have to go back and re-read your post what did you replace the house batteries after this incident or before?If you have a meter or someone with a meter I can help you troubleshoot over the phone. Please call me if you have any questions. I am more than happy to help and I am a professional electrical/electronic troubleshooter.