Performed a visual inspection of HVAC system and found AC and furnace running at the same time. Homeowner stated that temperature was unstable for both upstairs and downstairs. I checked the furnace and found jumper wire on Y1 and R causing the furnace to run continuously. Homeowner also stated that a strange sound was coming from the heat pump while in cooling mode. Further assessment determined that the high temperature from the furnace across the evaporator coil and refrigerant was the cause of the strain cell. Once the air temperature cooled down across the evaporator coil, the strainer sound started to dissipate. The high air temperature across the refrigerant coil was the issue. I will contact the homeowner within the next 48 hours to ensure issue has been resolved. No further issues at this time.