🏷️ Select Brand for Dedicated Error Guide
| Brand | Error Code | Fault Meaning & Symptoms | Suspected PCB Component | Lab Repair |
|---|---|---|---|---|
| Carrier | E1 | Carrier Inverter AC E1 Error Code Indoor Room Sensor AC shuts off immediately after powering on, displaying E1. | Indoor Display & Main PCB Sensor Circuit | WhatsApp Repair Board |
| Carrier | E1 | Carrier Inverter AC E1 Error Code Indoor Room Sensor AC shuts off immediately after powering on, displaying E1. | Indoor Display & Main PCB Sensor Circuit | WhatsApp Repair Board |
| Daikin | L5 | Daikin Inverter AC L5 Error Code Instantaneous Overcurrent Inverter compressor starts for 15-30 seconds then abruptly trips with L5 error on remote control. | High-power IPM Module (STK760-220A / PS219B4) | WhatsApp Repair Board |
| Daikin | L5 | Daikin Inverter AC L5 Error Code Instantaneous Overcurrent Inverter compressor starts for 15-30 seconds then abruptly trips with L5 error on remote control. | High-power IPM Module (STK760-220A / PS219B4) | WhatsApp Repair Board |
| Daikin | U4 | Daikin Inverter AC U4 Error Code PCB Repair Outdoor unit does not start; green LED on outdoor motherboard is dead or blinking 5 times; indoor fan runs with no cooling. | Outdoor Main Inverter Sub-PCB & Optocoupler Array | WhatsApp Repair Board |
| Daikin | U4 | Daikin Inverter AC U4 Error Code PCB Repair Outdoor unit does not start; green LED on outdoor motherboard is dead or blinking 5 times; indoor fan runs with no cooling. | Outdoor Main Inverter Sub-PCB & Optocoupler Array | WhatsApp Repair Board |
| LG Dual Inverter | CH05 | LG Dual Inverter AC CH05 Error Code PCB Repair Indoor unit beeps and displays CH 05. Outdoor compressor remains completely silent. | Dual Inverter Control PCB & Optocoupler Line | WhatsApp Repair Board |
| LG Dual Inverter | CH05 | LG Dual Inverter AC CH05 Error Code PCB Repair Indoor unit beeps and displays CH 05. Outdoor compressor remains completely silent. | Dual Inverter Control PCB & Optocoupler Line | WhatsApp Repair Board |
| Samsung | E464 | Samsung Inverter AC E464 Inverter Overcurrent Error Compressor vibrates heavily upon startup and instantly shuts down with E464 error code. | Compressor Inverter IPM Module | WhatsApp Repair Board |
| Samsung | E464 | Samsung Inverter AC E464 Inverter Overcurrent Error Compressor vibrates heavily upon startup and instantly shuts down with E464 error code. | Compressor Inverter IPM Module | WhatsApp Repair Board |
| Voltas | E6 | Voltas Inverter AC E6 Error Code Communication Failure Indoor display blinks E6 after 3 minutes. Compressor and outdoor condenser fan motor never kick on. | Outdoor SMPS Power Supply IC & Signal Bridge | WhatsApp Repair Board |
| Voltas | E6 | Voltas Inverter AC E6 Error Code Communication Failure Indoor display blinks E6 after 3 minutes. Compressor and outdoor condenser fan motor never kick on. | Outdoor SMPS Power Supply IC & Signal Bridge | WhatsApp Repair Board |
| Daikin | E7 | Daikin E7 Error Outdoor DC fan motor fault / Stall protection. Outdoor fan stops running. | Fan Motor Driver IC (Sanken / Toshiba), Driver Microcontroller Circuit. | WhatsApp Repair Board |
| Daikin | P4 | Daikin P4 Error Heat sink thermistor abnormality or PCB heatsink overheating. | Thermistor amplifier circuit, PCB thermal sensor, Burnt thermal compound. | WhatsApp Repair Board |
| Daikin | A6 | Daikin A6 Error Indoor BLDC fan motor lock or motor drive feedback circuit defective. | Indoor Fan Motor Driver IC, Hall Effect Sensor interface resistors. | WhatsApp Repair Board |
| Voltas | F1 | Voltas F1 Error IPM Module malfunction / Short-circuit protection trip. | Intelligent Power Module (IPM), 3-Phase Bridge Rectifier, 450V Filter Caps. | WhatsApp Repair Board |
| Voltas | F3 | Voltas F3 Error Compressor discharge temperature sensor error (open or short circuit). | Discharge sensor bias circuit, MCU analog input filter capacitor. | WhatsApp Repair Board |
| Voltas | P4 | Voltas P4 Error Inverter drive module temperature protection / Overheating. | Silicon thermal paste dry, Heatsink clamp looseness, Temperature sensor. | WhatsApp Repair Board |
| LG | CH05 | LG CH05 Error Serial communication failure between Indoor mainboard and Outdoor inverter board. | Communication transceiver circuit, Optocouplers, 5V isolated supply rail. | WhatsApp Repair Board |
| LG | CH21 | LG CH21 Error DC Peak / IPM overcurrent instantaneous trip on compressor startup. | IPM Power Stage (Mitsubishi / Fairchild), Inrush Current PTC resistor. | WhatsApp Repair Board |
| LG | CH26 | LG CH26 Error DC compressor position detection error / Inverter motor startup failure. | Back-EMF sensing network resistors, MCU gating control circuit. | WhatsApp Repair Board |
| LG | CH67 | LG CH67 Error Outdoor BLDC fan motor rotation abnormality / Locked rotor. | Outdoor Fan IC driver module, Hall IC signal conditioning circuit. | WhatsApp Repair Board |
| Carrier | P0 | Carrier P0 Error Inverter module (IPM) protection / IGBT short-circuit detection. | Outdoor Inverter Power Stage, DC link capacitor bank, PFC circuit. | WhatsApp Repair Board |
| Carrier | E3 | Carrier E3 Error Outdoor fan speed out of control / Fan motor driver error. | DC fan driver IC chip, 15V drive voltage regulation circuit. | WhatsApp Repair Board |
| Mitsubishi | E6 / U1 | Mitsubishi E6 / U1 Error Indoor/Outdoor transmission error (serial signal lost). | Outdoor power supply switching IC (TOP258 / LNK304), Filter caps. | WhatsApp Repair Board |
| Mitsubishi | U2 | Mitsubishi U2 Error Discharge temperature abnormality or high outdoor heat sink temp. | Thermistor circuit, ADC reference voltage line on main MCU. | WhatsApp Repair Board |
| Samsung | E101 | Samsung E101 Error Indoor unit cannot communicate with outdoor unit. | Outdoor PCB SMPS stage, Communication line diode array. | WhatsApp Repair Board |
| Panasonic | H11 | Panasonic H11 Error Indoor/Outdoor communication abnormal. Timer light blinks. | Outdoor sub-microcontroller, Optocoupler isolation, 12V regulator. | WhatsApp Repair Board |
| Panasonic | F99 | Panasonic F99 Error Outdoor direct current (DC) peak detection / Compressor stall. | IPM Power Transistors, DC bus voltage sensing resistors. | WhatsApp Repair Board |
| Blue Star | E1 | Blue Star E1 Error Indoor and outdoor communication failure. | Communication optocouplers, loop bias resistors, SMPS secondary 12V rail. | WhatsApp Repair Board |
| Blue Star | E5 | Blue Star E5 Error IPM module fault / Overcurrent / Overheat trip. | Outdoor IPM module, IGBT gate driver resistors, Current shunt. | WhatsApp Repair Board |
| Hitachi | 01 | Hitachi 01 Error Indoor/Outdoor communication fault. | Optocoupler circuit, 5V regulator, outdoor communication sub-processor. | WhatsApp Repair Board |
| Hitachi | 03 | Hitachi 03 Error Outdoor inverter instantaneous overcurrent / IPM trip. | IPM inverter module, heatsink thermistor, compressor wiring terminals. | WhatsApp Repair Board |
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