44 codes
Air conditioner error codes
Split and mini-split air conditioner codes from Daikin, Mitsubishi Electric, LG and Samsung. A tripped breaker, dirty filters and a blocked outdoor unit are worth checking first; anything involving refrigerant needs a qualified engineer.
DAIKINAC
Common problems
What it's doing, the code each brand shows for it, and what to check first.
Same fault, every brand
Find the fault you're seeing, then your brand. Each code opens its own page with the checks and a verdict.
| Fault | Samsung | LG | Daikin | Mitsubishi Electric | Other makes |
|---|---|---|---|---|---|
| Not drainingWater is left behind and won't pump out. | — | LGFL | — | MitsubishiP5 | — |
| Blocked filterThe filter needs cleaning. | SamsungCF | — | — | — | — |
| Temperature sensorA sensor can't read the temperature. | SamsungE121 | LGCH01CH02 | — | MitsubishiP1P2P9U4 | — |
| OverheatingIt got too hot and cut out. | — | LGCH61CH34 | DaikinF3 | — | — |
| Defrost problemIce is building up. | SamsungdF | — | DaikinA5 | MitsubishiP6 | — |
| Blocked airflowAir can't flow through the vent or duct. | — | — | DaikinF6 | — | — |
| Refrigerant or pressure protectionThe sealed refrigerant circuit is short of gas or outside its pressure limits. | SamsungE554 | LGCH38 | DaikinU0 | MitsubishiP8U2 | — |
| Fan motorA fan isn't turning. | SamsungE154E458 | LGCH10CH67 | DaikinA6E7 | MitsubishiU8 | — |
| Compressor or inverterThe compressor, or the electronics that drive it, has a fault. | — | LGCH21CH26 | DaikinE5E6H6L5 | MitsubishiUP | — |
| Communication faultTwo parts of the system can't talk to each other. | SamsungE101 | LGCH05CH53 | DaikinU4 | MitsubishiE6E9 | — |
| Control boardThe electronics or their wiring have a fault. | — | — | — | — | Other makesE1 |
| Power supplyThe electricity supply was cut or is out of range. | — | — | DaikinU2 | — | — |
Codes on other makes
Unbranded and less common machines use shorter generic codes. These are their most common meanings.
By brand
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344 codes from 24 brands, each one checked against the maker's own manuals and support pages.