Upon arrival, I assessed the thermostat and discovered it was unresponsive. Further investigation led to the electric heat strip contactor, where I identified a shorted 24 V coil. This issue was preventing the system from functioning correctly. I replaced the faulty contactor with a new one, ensuring all connections were secure and properly insulated. After the replacement, I tested the system to confirm that the heating element was operational. The customer was pleased to see the system restored, and the thermostat responded as expected. The job was completed efficiently, ensuring the customer's comfort was quickly restored.