Today I arrived on site to address the issue with the thermostat. Thermostat Issue:Found the thermostat locked in heat mode. Unlocked the thermostat. System Check:Confirmed the heating and AC systems (rooftop units) are now responding correctly to the thermostat. Upon arrival at the property. The client explained to me that someone locked the tstat in heat mode. The customer said that he turned off the power of the unit to prevent the system from continuing to run in heat mode. The client directed me to where the tstat is. I proceeded to verify the tstat. I found the tstat locked and calling poo Heat. I proceeded to unlock the tstat. Successfully unlocked the tstat. I put the tstat in off position. I proceeded to check the rooftop unit on the 2nd floor. I put the power back in on position. Start the tstat from the tstat. The system started normally. The customer mentioned that he just changed the batteries of the tstat. The batteries are new. I monitor the system for a