Came out to call for a system not heating properly. Customer stated that she could feel some heat, but it wasn’t a lot. Customer has a package unit with electrical heating elements. I checked the system over and found that one of the heating elements was not operating. I checked the sequencer function and it’s allowing power to the element, but the element itself isn’t functioning. Discussed with customer about repair needed. Customer wanted to replace the heating elements. I picked up new set of elements and swapped them out. Reconnected electrical wiring to new heating elements. Cycled heat on and checked operation. Made sure system completed a heating cycle. Unit is now heating properly.