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ao-smith HPTU-80N Heat Pump Water Heater Error Codes

Heat pump + electric backup, 80 gal

Error CodeFault Description
HP1High-pressure safety trip
HP2Low-pressure safety trip — possible refrigerant leak
HP3Compressor overtemperature fault
HP5Evaporator (refrigerant) temperature sensor fault
HP9Communication error between heat pump and tank control board