HVAC noise basement unit. Customer stated it sounded like something was in the outdoor fan shroud. Found system to be covered in ice. Upon insoection of equipment found the heat kit had a faulty safety switch not allowing it to turn on when system was in defrost. System lacked standard flood protection, had a dirty blower wheel and evap coil. Cleaned blower wheel and evap, added flood protection nd replaced heat kit due to switch no longer available. Broke as much ice off fan shroud housing as possible. Informed customer it’s possible if the conditions are correct for ice to build up around shroud again. Tested system and newly added safeties. System and safeties functioning properly at this time