Universal HVAC System Error Codes

G1 Universal HVAC System G1 on an HVAC system typically indicates a gas valve fault or gas ignition … G2 Universal HVAC System G2 on an HVAC system indicates a gas pressure fault. The system detected that … N1 Universal HVAC System The N1 error means the indoor unit and outdoor unit of your HVAC system cannot … N2 Universal HVAC System The N2 error means your thermostat and HVAC system have lost communication. The … N3 Universal HVAC System The N3 error means the HVAC system's zone controller has lost contact with one … N4 Universal HVAC System The N4 error means there is a communication conflict between multiple units … N5 Universal HVAC System The N5 error means your wireless remote control has stopped communicating with … S1 Universal HVAC System S1 on an HVAC system means the frost protection circuit has activated. The … S2 Universal HVAC System S2 on an HVAC system means the overheat protection circuit has activated. The … T1 Universal HVAC System T1 on an HVAC system indicates a problem with the outdoor temperature sensor. … V1 Universal HVAC System The V1 error means your HVAC system is not getting enough electrical voltage. … V2 Universal HVAC System The V2 error means your HVAC system detected a voltage spike or surge. Too much … V3 Universal HVAC System The V3 error means your HVAC is detecting unstable, fluctuating voltage. The … V4 Universal HVAC System The V4 error means there is a problem with a capacitor inside your HVAC unit. A … V5 Universal HVAC System The V5 error means the inverter board inside your HVAC unit has a DC voltage … W1 Universal HVAC System The W1 error means water has filled up the drain pan under your indoor unit. A … W2 Universal HVAC System The W2 error means the sensor that monitors water in the drain pan is not … W3 Universal HVAC System The W3 error means your condensate drain line is blocked. Water from normal AC … W4 Universal HVAC System The W4 error means the condensate pump that removes water from the drain pan has … W5 Universal HVAC System The W5 error means the water flow sensor has detected a problem with water … A1 Universal HVAC System Error code A1 on most HVAC systems means the indoor unit's float switch has … A2 Universal HVAC System Error code A2 on HVAC systems typically means the indoor coil (evaporator coil) … A3 Universal HVAC System Error code A3 on HVAC systems typically indicates the condensate drain pan is … A4 Universal HVAC System Error code A4 on HVAC systems typically indicates a communication error between … A5 Universal HVAC System Error code A5 on most HVAC systems is a freeze protection error. It means the … A6 Universal HVAC System Error code A6 on most HVAC systems means the indoor (evaporator) fan motor has a … B1 Universal HVAC System Error code B1 on an HVAC system typically indicates an outdoor unit … B2 Universal HVAC System Error code B2 on most HVAC systems indicates a fault with the indoor unit's fan … B3 Universal HVAC System Error code B3 on most HVAC systems is a communication fault between the indoor … B4 Universal HVAC System Error code B4 on most HVAC systems indicates a fault with the outdoor unit's … C1 Universal HVAC System HVAC error code C1 means the compressor failed to start within the expected time … C2 Universal HVAC System HVAC error code C2 typically indicates a communication fault between the indoor … C3 Universal HVAC System HVAC error code C3 typically indicates a communication fault between system … 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 … C9 Universal HVAC System HVAC error code C9 indicates a communication error between the indoor unit and … D1 Universal HVAC System Error code D1 on an HVAC system usually indicates a drain pan overflow or a … D2 Universal HVAC System Error code D2 on most heat pump and HVAC systems indicates a problem with the … D3 Universal HVAC System Error code D3 on most HVAC systems means the discharge temperature — the … D4 Universal HVAC System Error code D4 on most HVAC systems means the suction pressure — the pressure of … D5 Universal HVAC System Error code D5 on most HVAC systems means the compressor is drawing more … D6 Universal HVAC System HVAC error D6 means the defrost cycle — the process that melts frost buildup … D7 Universal HVAC System HVAC error D7 means the condensate drain pump or drain system has detected a … 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 … E13 Universal HVAC System E13 on an HVAC system typically indicates a refrigerant pressure fault. The … E14 Universal HVAC System Error E14 on an HVAC system typically indicates an abnormal refrigerant pressure … E15 Universal HVAC System Error E15 on an HVAC system typically indicates a compressor protection fault or … 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 … F13 Universal HVAC System Error F13 on an HVAC system indicates a problem with the fan motor or airflow. … F14 Universal HVAC System HVAC error code F14 indicates a fan motor speed error — the indoor or outdoor … 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 … H11 Universal HVAC System Error H11 on an HVAC system typically means the outdoor unit has detected an … H12 Universal HVAC System HVAC error code H12 indicates an outdoor ambient temperature sensor fault. The … H13 Universal HVAC System HVAC error code H13 indicates a problem with the outdoor unit's fan motor or the … H14 Universal HVAC System HVAC error code H14 means the system detected abnormally high pressure in the … H15 Universal HVAC System HVAC error code H15 indicates a low pressure fault in the refrigerant circuit. … 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 … L2 Universal HVAC System L2 on an HVAC system typically indicates an outdoor unit current fault or power … L3 Universal HVAC System HVAC error code L3 typically indicates a fault with the outdoor unit — most … L4 Universal HVAC System HVAC error code L4 typically indicates a drain pan overflow condition, a … L5 Universal HVAC System L5 means the DC bus voltage inside the inverter circuit has dropped below a safe … L6 Universal HVAC System HVAC error code L6 indicates an overcurrent or compressor overload condition. … L7 Universal HVAC System HVAC error code L7 means the indoor unit has lost communication with the outdoor … L8 Universal HVAC System HVAC error L8 means the compressor is drawing more electrical current than it … 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 … P10 Universal HVAC System HVAC error code P10 means the system detected dangerously high pressure in the … P11 Universal HVAC System HVAC error code P11 means the system detected dangerously low pressure in the … P12 Universal HVAC System HVAC error code P12 indicates a power supply voltage fault — the unit is … 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 … P9 Universal HVAC System P9 on an HVAC system typically indicates a compressor inverter module fault. … R1 Universal HVAC System Error code R1 on HVAC systems most commonly indicates a refrigerant pressure … R2 Universal HVAC System HVAC error code R2 typically indicates a communication or sensor fault between … R3 Universal HVAC System HVAC error code R3 typically signals a fault with the outdoor unit's fan motor. … U1 Universal HVAC System HVAC error code U1 means the system detected an overcurrent condition in the … U10 Universal HVAC System HVAC error U10 means the inverter drive module in the outdoor unit detected a … 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 … U5 Universal HVAC System U5 on an HVAC system typically means the indoor unit fan motor has stopped … U6 Universal HVAC System HVAC error code U6 means the system detected that the compressor is drawing too … U7 Universal HVAC System HVAC error code U7 typically indicates a fault with the DC fan motor — usually … U8 Universal HVAC System HVAC error U8 means the outdoor unit's main PCB (Printed Circuit Board) has … U9 Universal HVAC System HVAC error U9 means the system has detected that the indoor and outdoor units do …