I have a NOMA Programmable 7-Day Thermostat, but today it seems to have gone strange. I had it on the Cool and heat started coming out of the vents. I thought the air conditioning was broken, so I turned the thermostat off, but a little while later the vent came on with hot air again? How is that possible if the thermostat is off. I have tried resetting the thermostat by pressing reset and taking out the batteries, but it is not resetting? What should I do before calling a repair man for $99 dollars an hour?

Help me please