FAULT CODE DIRECTORY

Find out what your AC’s error code actually means.

A running reference of error and fault codes across split, window, commercial and VRF air conditioners — sorted by brand, with plain-language causes and what to check before calling a technician. Covers brands sold across Asia, North America, Europe and beyond.

Browse by AC type

3 categories

Split AC

Indoor + outdoor unit systems — LG, Samsung, Voltas, Daikin, Hitachi, Blue Star, Panasonic, Godrej, Whirlpool.

Window AC

Single-unit room ACs — blink patterns and buzzer codes across major global brands.

Commercial & VRF

Ductable, cassette, tower AC and VRF/VRV systems — Daikin VRV, Mitsubishi, LG Multi V, Toshiba, Hitachi, Samsung DVM, Panasonic ECOi, Carrier, Voltas.

Popular brands

jump straight to a brand’s codes

LG AC codes

CH, E1–E5, U4, U6 series.

Samsung

Samsung AC codes

E1–E5, ED, EE series.

Daikin

Daikin AC codes

U-series and blink codes.

Voltas

Voltas AC codes

F1–F9 fault series.

Blue Star

Blue Star AC codes

P and E series.

Hitachi

Hitachi AC codes

Blink-pattern diagnostics.

Panasonic

Panasonic AC codes

H, F, U series.

Carrier

Carrier AC codes

Residential and ductable.

How to use this site

Most AC error codes are shown one of three ways: on an indoor unit’s LED display, as a blink pattern on the operation/timer light, or as a beep count from the indoor unit’s buzzer. Find your brand’s page, match the code or blink pattern, and check the likely cause before opening any panel. Codes tied to gas pressure, compressor, or PCB faults are best left to a licensed technician — this site explains what a code means, not how to repair sealed refrigerant systems yourself.