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Service Type: Demand Service Technician Summary: Upon arrival, the client reported that the system was not operational. The 1050 thermostat was displaying a hard lockout. I reviewed the system’s alert history via the diagnostic flow chart. The records indicated two key issues: • Communication failure with the outdoor unit • A possible high-voltage issue I proceeded to inspect the electrical components: • Verified incoming power at the disconnect box • Checked power output to the condenser • Tightened all contact points I de-energized and then re-energized the equipment. During reassembly, I noticed a buzzing noise coming from the disconnect box, indicating an electrical arc. Upon further inspection: • Tightened the disconnect prongs • Tightened the fuse brackets • Replaced both fuses After re-energizing the system, the buzzing noise was no longer present. I moved and tested components within the fuse box to ensure all connections were secure—everything was tight and prope