Error Code	Symptom	Fault Type	Guide
E0	Tempstar air conditioner indoor unit display shows E0 and system will not respond to thermostat commands	Indoor Unit Communication Fault	View Details
E1	Tempstar air conditioner shows E1 and will not start cooling cycle	High-Pressure Protection Trip	View Details
E2	Tempstar air conditioner displays E2 and indoor unit stops cooling intermittently	Low-Pressure Protection / Loss of Charge	View Details
E3	Tempstar air conditioner shows E3 and outdoor unit shuts down shortly after starting	Compressor Overload / Overcurrent Protection	View Details
E4	Tempstar air conditioner indoor display shows E4 and cooling stops during operation	Evaporator Coil Freeze Protection / Anti-Freeze Alarm	View Details
E5	Tempstar air conditioner shows E5 and outdoor unit does not start	Outdoor Unit Communication / Feedback Fault	View Details
E6	Tempstar air conditioner displays E6 and system shuts down shortly after starting	Indoor/Outdoor Mismatch or Phase Error (for some inverter models)	View Details
E7	Tempstar air conditioner indoor unit shows E7 and outdoor fan does not run	Outdoor Fan Motor Fault	View Details
E8	Tempstar air conditioner shows E8 and indoor unit stops with poor cooling performance beforehand	Indoor Fan Motor Fault / Overload	View Details
E9	Tempstar air conditioner indoor display shows E9 and unit will not operate	EEPROM / Control Board Memory Error	View Details
F0	Tempstar ductless mini-split indoor unit displays F0 and stops cooling	Refrigerant System Low Charge / Protection	View Details
F1	Tempstar ductless mini-split indoor unit shows F1 and does not respond to remote commands	Indoor Ambient Temperature Sensor Fault	View Details
F2	Tempstar ductless mini-split indoor unit displays F2 and cooling stops	Evaporator Coil Temperature Sensor Fault	View Details
F3	Tempstar ductless mini-split indoor unit shows F3 and unit shuts down	Outdoor Coil Temperature Sensor Fault	View Details
F4	Tempstar ductless mini-split indoor unit displays F4 and no cooling occurs	Outdoor Discharge Temperature Sensor Fault	View Details
F5	Tempstar ductless mini-split shows F5 and system cycles off quickly	Outdoor Ambient Temperature Sensor Fault	View Details
F6	Tempstar ductless mini-split indoor unit displays F6 and compressor does not start	Compressor Current / Inverter Module Fault	View Details
F7	Tempstar ductless mini-split indoor unit shows F7 and outdoor fan does not operate correctly	Outdoor Fan Speed Feedback Fault	View Details
F8	Tempstar ductless mini-split indoor unit displays F8 and unit stops after short operation	Indoor Fan Speed Feedback Fault	View Details
F9	Tempstar ductless mini-split indoor unit shows F9 and does not cool properly	Indoor Unit EEPROM / Configuration Error	View Details
–	Tempstar air conditioner blows warm air from vents even though outdoor unit is running	Indoor/Outdoor Mismatch or Reversing Valve Stuck (heat pump models)	View Details
–	Tempstar air conditioner causes certain rooms to be much warmer than others	Air Distribution / Duct Imbalance	View Details
–	Tempstar air conditioner causes high humidity indoors even when cooling	Poor Dehumidification	View Details
–	Tempstar air conditioner emits a musty or moldy smell when running	Biological Growth in Evaporator and Drain System	View Details
–	Tempstar air conditioner indoor unit freezes up with ice on the evaporator coil	Evaporator Coil Icing	View Details
–	Tempstar air conditioner outdoor unit does not run but indoor blower does	Outdoor Unit Non-Operation	View Details
–	Tempstar air conditioner outdoor unit hums but fan and compressor do not start	Failed Start/Run Capacitor	View Details
–	Tempstar air conditioner outdoor unit runs but indoor coil is not cold, lines are warm	Loss of Refrigerant Charge / Flow Restriction	View Details
–	Tempstar air conditioner outdoor unit runs continuously and rarely shuts off	Continuous Operation	View Details
–	Tempstar air conditioner outdoor unit vibrates excessively	Outdoor Vibration / Mounting Issue	View Details
–	Tempstar air conditioner runs but does not cool the home adequately	Insufficient Cooling Capacity / Performance Loss	View Details
–	Tempstar air conditioner runs but indoor unit or furnace area is leaking water	Condensate Drainage Failure	View Details
–	Tempstar air conditioner short cycles, turning on and off frequently	Short Cycling	View Details
–	Tempstar air conditioner thermostat display is blank and system does not run	Thermostat Power Loss	View Details
–	Tempstar air conditioner trips the breaker when starting or during operation	Overcurrent / Electrical Fault	View Details
–	Tempstar air conditioner will not start at all, no indoor or outdoor operation	No-Start Condition	View Details
–	Tempstar indoor unit makes loud rattling or buzzing noises during operation	Indoor Mechanical Vibration / Noise	View Details
–	Tempstar outdoor unit is very loud, with grinding or squealing noises	Outdoor Mechanical Noise	View Details
–	Tempstar outdoor unit runs but indoor blower does not, little or no air from vents	Indoor Blower Failure	View Details

Tempstar Air Conditioners Error Codes

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