HVAC Error Codes

C1 Universal HVAC System HVAC error code C1 means the compressor failed to start within the expected time … C4 Universal HVAC System HVAC error code C4 typically means the condensate drain float switch has … C5 Universal HVAC System HVAC error code C5 indicates a problem with the indoor unit's swing motor or … C6 Universal HVAC System C6 means your HVAC system has detected a fault with the outdoor unit's fan … C7 Universal HVAC System Error C7 means the outdoor temperature sensor on your HVAC system has a problem. … C8 Universal HVAC System Error C8 means the condensate drain sensor inside your HVAC unit has detected … E0 Universal HVAC System HVAC error code E0 indicates a communication failure or general system fault. On … E1 Universal HVAC System E1 means the room temperature sensor in your air conditioner or heat pump has a … E10 Universal HVAC System HVAC error code E10 means the system has detected a mismatch between the indoor … E11 Universal HVAC System HVAC error code E11 typically indicates a communication error between the indoor … E12 Universal HVAC System Error E12 means the refrigerant pressure inside your HVAC system is outside the … E2 Universal HVAC System E2 means the coil temperature sensor (also called the evaporator or pipe sensor) … E3 Universal HVAC System E3 means the low pressure protection switch has tripped in your HVAC system. … E4 Universal HVAC System E4 means the compressor has triggered its overload protection and shut down. The … E5 Universal HVAC System E5 means the overcurrent protection has activated in your HVAC system. The unit … E6 Universal HVAC System E6 on an HVAC system means the indoor unit and outdoor unit are not … E7 Universal HVAC System E7 means the outdoor fan motor in your HVAC system has failed or is not … E8 Universal HVAC System E8 means the indoor fan motor — also called the blower motor — has a problem. … E9 Universal HVAC System E9 means the outdoor coil temperature sensor has a problem. This sensor monitors … F0 Universal HVAC System HVAC error code F0 typically indicates a sensor initialization failure or a … F1 Universal HVAC System F1 on an HVAC system typically means the ambient temperature sensor — sometimes … F10 Universal HVAC System HVAC error code F10 means the indoor evaporator coil has frozen or iced over, … F11 Universal HVAC System HVAC error code F11 typically indicates an outdoor fan motor fault. The outdoor … F12 Universal HVAC System Error F12 means the inverter control board inside your outdoor HVAC unit has … F2 Universal HVAC System F2 on an HVAC system typically means there is a fault with the evaporator coil … F3 Universal HVAC System HVAC error F3 indicates a condenser coil temperature sensor fault. The sensor … F4 Universal HVAC System HVAC error F4 indicates a discharge line temperature sensor fault. The discharge … F5 Universal HVAC System HVAC error F5 indicates a suction line temperature sensor fault. The suction … F6 Universal HVAC System F6 means the outdoor ambient temperature sensor is not working correctly. This … F7 Universal HVAC System F7 means the outdoor discharge temperature sensor has a fault. The discharge … F8 Universal HVAC System F8 means the compressor has reached a dangerously high temperature and shut … F9 Universal HVAC System F9 means the IPM module — the Intelligent Power Module — has triggered its … H1 Universal HVAC System HVAC code H1 means your heat pump has entered defrost mode. This is a completely … H10 Universal HVAC System HVAC error code H10 typically indicates a defrost failure or a heat pump defrost … H2 Universal HVAC System H2 means the compressor is drawing more electrical current than it should. The … H3 Universal HVAC System H3 means the compressor's internal thermal overload protector has tripped. Every … H4 Universal HVAC System H4 means the HVAC system has detected an abnormal operating condition and has … H5 Universal HVAC System H5 means the IPM module — the Intelligent Power Module — has failed or detected … H6 Universal HVAC System HVAC error H6 means the indoor blower fan has stopped running or is running at … H7 Universal HVAC System HVAC error code H7 means the system detected a problem with the outdoor … H8 Universal HVAC System H8 means your HVAC system has detected a problem with the current (amperage) … H9 Universal HVAC System H9 means your HVAC system has detected a fault with the outdoor ambient … L1 Universal HVAC System HVAC error code L1 means the outdoor unit has detected an internal abnormality … L5 Universal HVAC System L5 means the DC bus voltage inside the inverter circuit has dropped below a safe … L9 Universal HVAC System HVAC error code L9 typically indicates a compressor overload or a capacity … LC Universal HVAC System HVAC error code LC typically means there is a drain blockage, float switch trip, … P1 Universal HVAC System HVAC error code P1 means the system detected a problem with voltage or power … P2 Universal HVAC System HVAC error code P2 usually means there is a high-pressure fault in the … P3 Universal HVAC System HVAC error code P3 means the system detected dangerously high pressure on the … P4 Universal HVAC System HVAC error code P4 typically indicates an inverter or compressor module fault. … P5 Universal HVAC System HVAC error code P5 means the control board has lost communication with the … P6 Universal HVAC System P6 means the Intelligent Power Module (IPM) inside your HVAC unit has triggered … P7 Universal HVAC System HVAC error code P7 commonly indicates a power supply voltage problem or a DC bus … P8 Universal HVAC System Error P8 means the IPM (Intelligent Power Module) inside your HVAC system has … U1 Universal HVAC System HVAC error code U1 means the system detected an overcurrent condition in the … U2 Universal HVAC System U2 means your HVAC system has detected that the supply voltage is abnormal — … U3 Universal HVAC System U3 indicates a charge circuit fault in your HVAC system. Most commonly this … U4 Universal HVAC System HVAC error code U4 means the indoor unit and the outdoor unit have lost …