Upon arrival heat pump was tripped on high pressure cut off reset system and perform tune up checked indoor filter coil and blower all three were acceptable all electrical connections were acceptable as well. Checked all components of the heat pump refrigerant levels were acceptable at this time go run cap and compressor saver were within manufacturer range outdoor coil was compacted with dust and dirt potentially causing the high pressure limit to trip found no other issues at this time recommended UV system and unit surge protection If customer calls in with same issue a supervisor will need to be present to find intermittent issue