Today, we're in the city of Long Beach performing a maintenance on a heat pump package unit. I am checking all electrical components checking refrigerant pressures. Testing the unit on heat and cool to make sure everything is running efficiently. I am also changing filters, cleaning the blower cabinet , and washing the outdoor coil. We found burn marks on the control board that might have been caused by an electrical surge like a black out or brown out. That's why it is always recommended to get an electric al surge protector on your system to avoid damage to all the electrical components. Call Southwest HVAC at 5624264822 and ask for Erick, the maintenance technician, to get one installed.