Upon inspection, the thermostat was found to be severely burnt, indicating a significant electrical issue. I promptly replaced the faulty thermostat with a new, high-quality unit. This involved carefully disconnecting the old thermostat from the wiring and mounting the new one securely. After ensuring all connections were properly made, I tested the system to confirm that the new thermostat was functioning correctly. The heating and cooling unit is now operational, providing reliable temperature control. This replacement has restored the system's efficiency and ensured the comfort of the occupants.