Overnight, the electric reheat in the ducting of the VEA continued heating the space, even though the automation system was commanding the heat off. The space rose over set point by several degrees, which made relocking the IFO infeasible. I checked the control circuit of the heater and didn't find any obvious problems. Once I re-energized the control circuit, the heat remained off, making it difficult to find the cause of the problem. I watched the heater cycle normally per automation command, so for the time being it is working correctly. I will monitor it throughout the day.