Diagnostic Fault Decoder • LG Dual Inverter & GE Window AC
Blinking Light Error Codes AC Repair Oahu
Is your window AC LED blinking in a repeated pattern or displaying a CH or F error code? Decode your diagnostic fault code below and schedule an on-site inspection or replacement consultation with our Oahu window AC specialists.
TRY THIS FIRST
The 5-Minute Power Reset Procedure
Voltage sags on the HECO power grid can lock up microprocessors. Unplug your window AC (or turn OFF its circuit breaker), wait 5 full minutes for memory buffers to clear, then plug it back in and press RESET on the plug head. If the error code flashes again, a physical sensor or board inspection is required.
Wait 5 Full Minutes
Discharges internal capacitors
Brand Guide
LG Dual Inverter Window AC Error Codes
CH01 / 1 Blink
Indoor Room Air Thermistor Open/Short
Technician Solution: Ohm-test room thermistor resistance (10k ohms at 77°F) and replace sensor clip.
CH02 / 2 Blinks
Evaporator Pipe Thermistor Error
Technician Solution: Inspect copper evaporator tube clip contact, test resistance (5k ohms at 77°F).
CH05 / 5 Blinks
Main Control Board to Inverter Module Signal Error
Technician Solution: Inspect internal wire harness between front display PCB and inverter control board.
CH06 / 6 Blinks
Inverter DC Peak / High Discharge Temperature
Technician Solution: Clean clogged condenser coils, verify fan blade rotation, and check inverter module.
CH21 / 21 Blinks
Compressor Overcurrent / Locked Rotor Protection
Technician Solution: Verify 115V/230V supply voltage, inspect inverter power board, or evaluate replacement.
Brand Guide
GE Window & Built-In Wall Sleeve Error Codes
F1 / E1
Room Temperature Sensor Fault
Technician Solution: Inspect front intake thermistor plug on control board and replace sensor if open.
F2 / E2
Evaporator Frost Sensor Fault
Technician Solution: Thaw frozen evaporator coil, clean air filter, and test coil thermistor resistance.
E4 / E5
Exterior Condenser Coil Over-Temperature / Fan Fault
Technician Solution: Clear exterior louver blockage, rinse salt-crusted condenser fins, and test fan motor.
FL / E8
Base Pan High Water Level / Drain Plug Alert
Technician Solution: Clear rear condensate drain port and verify 3/8-inch exterior tilt pitch.
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Schedule Error Code Diagnostic
Our technicians carry digital test equipment and can evaluate whether an in-place sensor fix or unit upgrade is most cost-effective.
Error Code FAQs
On LG Dual Inverter and GE digital window units, the LED display will show a 2-character code (such as CH01, CH02, CH21, F1, or F2) or blink the Clean Filter / Power LED in a repeating sequence. Count the flashes between pauses or note the digital code shown on the front panel.
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