WINDOW AC Window AC error codes and blink patterns. Single-unit room air conditioners often show faults as a blinking timer light or a beep count rather than a text code. Here’s what the common patterns mean.
Jump to: LG · Voltas · Samsung · Godrej · Blue Star · Carrier · Frigidaire · Friedrich
Before you search: window AC display panels vary a lot between model years. If your unit has no display at all, count how many times the timer/operation light blinks between pauses — that count is your code.
Safety first: burning smell, sparking, or a tripped breaker means a possible short circuit — cut power at the main board and call an electrician. Suspected gas leakage or refrigerant faults need a certified technician with proper equipment. See the full
disclaimer before acting on any code.
LG LG › Code Likely meaning What to check E1 Room temperature sensor open or short Sensor connector loose behind the front grille. E2 Evaporator coil sensor error Check the coil sensor clip and wiring. EC Cooling coil frost/temperature fault Check for restricted airflow through the filter. E3 Overload / compressor protection Check for a dirty filter restricting airflow. E4 High pressure protection Check outdoor coil side isn’t blocked by debris. E5 Low voltage protection Check incoming supply voltage. E6 Control board communication fault Internal wiring fault — needs technician inspection. E7 Compressor overcurrent protection Check for restricted airflow or an aging compressor. E8 Refrigerant leak detection Needs a technician with gauges — not a DIY fix. E9 Display or keypad button stuck Check the control panel buttons aren’t jammed.
VT Voltas › Code Likely meaning What to check F1 Room temperature sensor error Sensor wiring near the intake grille. F2 Evaporator coil sensor error Check coil sensor position and connection. 3 beeps Overload / high current protection Check for a dirty filter restricting airflow. F3 Compressor coil sensor error Check the compressor coil sensor connection. F4 Overload protection tripped Check outdoor coil side ventilation. F5 Control board communication error Internal wiring fault — needs technician inspection. F6 EEPROM (memory) error Control board fault, usually needs service. F7 High pressure protection Check for blocked airflow through the outdoor coil side. F8 Low voltage protection Check incoming supply voltage. F9 Compressor overcurrent Check for restricted airflow or an aging compressor.
SS Samsung › Code Likely meaning What to check E1 Room temperature sensor error Sensor connector behind the front panel. E2 Coil temperature sensor error Check coil sensor connection. E3 Overload protection Check for a dirty filter restricting airflow. E4 High pressure protection Check outdoor coil side ventilation. E5 Low voltage protection Check incoming supply voltage. E6 EEPROM (memory) error Control board fault, usually needs service. E7 Fan motor error Check for obstruction or a failed motor. E8 Compressor overcurrent Check for restricted airflow or an aging compressor. E9 Gas leak detection Needs a technician with gauges — not a DIY fix. E10 Fan motor error Check for obstruction or a failed motor.
GJ Godrej › Code Likely meaning What to check E1 Room sensor error Check sensor wiring behind the intake grille. E2 Coil sensor error Check the coil sensor clip. E3 Overload protection Check for a dirty filter restricting airflow. E4 High pressure protection Check outdoor coil side ventilation. E5 Low voltage protection Check incoming supply voltage. E6 EEPROM (memory) error Control board fault, usually needs service. E7 Fan motor error Check for obstruction or a failed motor. E8 Compressor overcurrent Check for restricted airflow or an aging compressor. E9 Gas leak detection Needs a technician with gauges — not a DIY fix. E10 Control board communication fault Internal wiring fault — needs technician inspection.
BS Blue Star › Code Likely meaning What to check E1 Room temperature sensor error Sensor connector loose inside the unit. P1 High pressure / overload protection Check for blocked airflow through the outdoor coil side. E2 Coil temperature sensor error Check the coil sensor connection. E3 EEPROM (memory) error Control board fault, usually needs service. E4 Control board communication fault Internal wiring fault — needs technician inspection. P2 Low pressure protection Possible refrigerant shortage — needs gauge check. P3 Compressor overcurrent protection Check for restricted airflow or an aging compressor. E5 Fan motor error Check for obstruction or a failed motor. E6 Gas leak detection Needs a technician with gauges — not a DIY fix. E7 Low voltage protection Check incoming supply voltage.
CR Carrier › Code Likely meaning What to check E1 Room temperature sensor error Check sensor connector behind the front panel. E3 Overload / high current protection Check filter cleanliness and airflow. E2 Coil temperature sensor error Check the coil sensor connection. E4 High pressure protection Check outdoor coil side ventilation. E5 Low voltage protection Check incoming supply voltage. E6 Control board communication fault Internal wiring fault — needs technician inspection. E7 EEPROM (memory) error Control board fault, usually needs service. E8 Fan motor error Check for obstruction or a failed motor. E9 Compressor overcurrent Check for restricted airflow or an aging compressor. E10 Gas leak detection Needs a technician with gauges — not a DIY fix.
FD Frigidaire (North America) › Code Likely meaning What to check E1 Room temperature sensor error Check sensor connector behind the front panel. E2 Coil temperature sensor error Check the coil sensor connection. HL High/low voltage protection Check incoming supply voltage. LC Low refrigerant charge indication Possible refrigerant issue — needs technician check. FL Filter/coil frost condition Check for a dirty filter restricting airflow. PF Power failure — unit needs manual reset Power-cycle the unit at the wall outlet. F1 Control board / EEPROM error Control board fault, usually needs service. E3 Overload protection Check for a dirty filter restricting airflow. E4 Fan motor error Check for obstruction or a failed motor. E5 Communication / control fault Internal wiring fault — needs technician inspection.
FR Friedrich (North America) › Code Likely meaning What to check FL Filter/coil frost protection Check for a dirty filter restricting airflow. E1 Room temperature sensor error Check sensor connector behind the front panel. E2 Coil temperature sensor error Check the coil sensor connection. E3 Overload protection Check for a dirty filter restricting airflow. E4 Fan motor error Check for obstruction or a failed motor. E5 EEPROM (memory) error Control board fault, usually needs service. E6 High voltage protection Check incoming supply voltage. E7 Low voltage protection Check incoming supply voltage. E8 Communication fault Internal wiring fault — needs technician inspection. E9 Compressor overcurrent Check for restricted airflow or an aging compressor.
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Have a split, ductable or commercial unit instead? See split AC codes or commercial & VRF codes .
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