Upon arrival, I found the thermostat completely unresponsive, displaying a blank screen. After inspecting the device, I identified that the issue was due to depleted batteries. I replaced the dead batteries with new ones and conducted a thorough test to ensure the thermostat was functioning correctly. Post-replacement, I verified that the heating system was operational and responding to the thermostat's commands. The customer was pleased with the restored functionality and the efficient resolution of the issue.
