Professional Installation Required! Please read and retain these troubleshooting instructions.
ERROR CODES – TABLE OF CONTENTS Reference ErrorName Code Internal Temperature Sensor Error E1 External Coil Sensor Error E2 Internal Coil Sensor Error E3 Internal Fan Error Of Indoor Unit E4 Indoor Unit And Outdoor Unit Communication Error E5 External DC Fan Error F0 Module Protection Error F1 PFC Protection Error F2 Compressor Out-of-Step Error F3 Exhaust Sensor Error F4 Compressor Top Head Sensor Error F5 External Temperature Sensor Error F6 OVP Or UVP Error F7 Outdoor Unit Con
TERMS GUIDE/TABLE OUTLINE Cause of Error Cause: Explains the most common error cause. Inspection path: The order of troubleshooting. Tools Required Tools that should be utilized to fix/maintenance the error. Possible Broken Part Any possibly broken part related to the error that may need to be replaced. Troubleshooting Procedures All the troubleshooting procedures are prepared from simple to complex, from surface to internal, and from test to replacement.
E1 – INTERNAL TEMPERATURE SENSOR ERROR Cause of Error Cause: The unit detects a short circuit or open circuit of the indoor temperature sensor during the inspection of main control panel in the indoor unit, indicated by “internal temperature sensor error”. Inspection path: Sensor → Sensor wire → Connectors → Main indoor unit control panel Tools Required Multimeter, 15KΩ standard sensor (25℃) Possible Broken Part Internal temperature sensor, main internal control panel 1.
E2 – EXTERNAL COIL SENSOR ERROR Cause of Error Tools Required Possible Broken Part Cause: The unit detects a short circuit or open circuit of the outdoor unit coil sensor during the inspection of the outdoor unit control panel, indicated by “external coil sensor error”. Inspection path: Sensor → Sensor wire → Connectors → Main outdoor unit control panel Multimeter, 20KΩ standard sensor (25℃） External coil sensor, outdoor unit control panel 1. 2. 3. Troubleshooting Procedures Key Details 4. 5.
E3 – INTERNAL COIL SENSOR ERROR Cause of Error Cause: The detection of short circuit or open circuit of internal coil sensor during the inspection of main internal control panel, indicated by “internal coil sensor error”. Inspection path: Sensor → Sensor wire → Connectors → Main internal control panel Tools Required Multimeter, 20KΩ standard sensor (25℃） Possible Broken Part External coil sensor, outdoor unit control panel 1. 2. 3. Troubleshooting Procedures 4. 5.
E4 – INTERNAL FAN ERROR (INDOOR PG MOTOR) Cause of Error Cause: The PG motor is equipped with a speed feedback signal line. When the feedback signal is not received by the control panel, it has no way to recognize the fan moving. This will be indicated as “Internal fan error”. Tools Required Multimeter, A PG motor Possible Broken Part Mechanical error, PG motor, control panel 1. 2. 3. Troubleshooting Procedures 4. 5. Check if the fan can work for 1 minute by itself before the error occurs.
E5 – INTERNAL & EXTERNAL COMMUNICATION ERROR Cause of Error Cause: The frequency converter needs internal and external communication. When the communication cannot be reached, the internal and external units will indicate “internal and external communication error”.
F0 – EXTERNAL DC FAN ERROR Cause of Error Tools Required Possible Broken Part Cause: The main control panel will indicate “external DC fan error” when it detects an imbalanced current on the three lead wires of the drive motor. Inspection path: Is the DC fan stuck due to foreign material? → Motor terminal connectors → Outdoor unit control panel → Motor Outdoor unit control panel in normal condition Mechanical jam of external fan, outdoor unit control panel, external DC motor 1. 2.
F1 – MODULE PROTECTION ERROR Cause of Error Cause: The power module is the part to directly drive the compressor to work. It can protect the machine in time when overcurrent, overvoltage or overheat occurs and stops the compressor from working. It will, at the same time, send a “shutdown request” to the module panel. The error triggered by the “shutdown request” is called “module protection error”.
F2 – PFC PROTECTION ERROR Cause of Error Cause: PFC board is a component of the inverter air conditioner for power factor correction and voltage boosting. When the PFC board cannot perform power calibration as normal because of overcurrent and overvoltage, it will indicate “PFC protection error” and its function may also be integrated with the module panel or main control panel.
F3 – COMPRESSOR OUT-OF-STEP ERROR Cause of Error Tools Required Possible Broken Part Cause: The module panel will constantly test the current of lead wires of the compressor and calculate the position of the rotator of the compressor. When the compressor deviates far from the normal operating status , it will indicate “compressor out-ofstep error” because the current of the compressor wires is too high or it cannot detect the position of the rotator. This error always follows “module protection error”.
F4 – EXHAUST SENSOR ERROR Cause of Error Tools Required Possible Broken Part Cause: The outdoor unit control panel will indicate “exhaust sensor error” and send it to the main internal control panel when it detects short circuit or open circuit of the exhaust sensor. Inspection path: Exhaust sensor → Sensor wire → Connectors → Main external control panel Multimeter, 50KΩ standard exhaust sensor Exhaust sensor, outdoor unit control panel 1. 2. 3. Troubleshooting Procedures 4. 5.
F5 – COMPRESSOR TOP HEAD SENSOR ERROR Cause of Error Cause: The compressor top head sensor is a compressor top head temperature protection switch most of the time. It keeps closed (short circuit) when the compressor temperature is normal and switches off (open circuit) when the temperature is too high. The outdoor unit control panel will indicate “compressor top head sensor error” when it senses disconnection of the compressor top head protection switch.
F6 – EXTERNAL TEMPERATURE SENSOR ERROR Cause of Error Cause: The detection of short circuit or open circuit of external termperature sensor during the inspection of outdoor unit control panel, indicated by "external termperature sensor error". Inspection path: Sensor → Sensor wire → Connectors → Outdoor unit control panel Tools Required Multimeter, 15KΩ standard sensor Possible Broken Part External temperature sensor, outdoor unit control panel. 1. 2. 3. Troubleshooting Procedures Key Details 4. 5.
F7 – OVP OR UVP ERROR Cause of Error Cause: When the supply voltage is lower than 135V or higher than 275V, the inspection, circuit would detect over or under voltage protection signal and send it to the outdoor unit control panel and the outdoor unit control panel would initiate an "OVP or UVP error" and indicate it through the internal motor.
F8 – OUTDOOR UNIT CONTROL PANEL AND MODULE PANEL COMMUNICATION ERROR Cause of Error Cause: Only the models with the module panels separated with the outdoor unit control panels may have this error. When the machine is running normally, the module panel and the outdoor unit control panel would coordinate with each other on the communication to work and when the communication is off, the outdoor unit control panel would raise the alarm of "main control panel and module panel communication error".
F9 – OUTDOOR EE ERROR Cause of Error Tools Required Possible Broken Part Troubleshooting Procedures Cause: Parameters are stored in an “EE” chip for the unit to run properly. The motor on the outdoor unit control panel can only work after reading the data stored in EE and if not read, the alarm "outdoor EE error" would be reported and raised in the internal machine. Reasons for data not being read are as follows: 1. Wrong EE chip data format; 2. EE chip is broken; 3.
FA – RECIRCULATED SENSOR ERROR Cause of Error Cause: When the main control panel detects an open circuit or short circuit of the recirculated sensor, it would raise an alarm of "recirculated sensor error" and send it to the main internal control panel to indicate it.
FB – PROTECTION OF FREQUENCY CONVERSION Cause of Error Cause: In routine operation of the unit, there will be times where the unit will need to protect the compressor during defrost, overheating, or undercooling. Three indicator lights are used on the outdoor unit control panel to signify this protection is occurring.
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