Addressed a low cooling issue caused by the heat running simultaneously. Diagnosed the problem as a faulty sequencer, which was causing the heating elements to remain active. Disconnected power and safely removed the defective sequencer. Installed a new sequencer, ensuring proper electrical connections. Restored power and tested the system, confirming that the heating elements were no longer running during cooling mode. Verified that the air conditioning was functioning correctly, restoring optimal cooling performance for the customer.