Diagnostic call for no heat. Upon arrival system was non operational. Set to heat. Air handler turns on but not the heat pump. System is completely flat on charge and heat pump is locked out on low pressure. Performed UV leak dye search. Found big leak on bleeder line off of outdoor txv. Charged system up with 7 pounds of R410A per manufactures specifications and adding in for line set and evap coil. Pressures are a little out of spec still but will definitely keep the house warm until we can return to recover and charge system after welding up the leak. Will call 8nt the morning to set an Immediate follow up to finish the quoted repairs. System is operational and heating at this time