Daikin Air Conditioner Error Codes List: Every Code Explained

Every Daikin air conditioner error code we could verify against Daikin's own documentation — what it means, what usually causes it, and the first fix to try — in one table. Codes differ between model series, so treat your model's tech sheet as the final word.

How to read and retrieve error codes on Daikin air conditioners

Daikin builds the diagnosis into the remote controller. On residential wireless remotes (the ARC433 family and its successors) Daikin's operation manual documents fault diagnosis by remote controller: point the remote at the indoor unit and hold the TIMER CANCEL button down for 5 seconds — a code indication flashes in the temperature display section, starting from '00' (normal). Then press TIMER CANCEL repeatedly: each press steps the displayed code through Daikin's list, and the indoor unit answers with beeps. A continuous long beep at a code means that code is the malfunction the unit is reporting; a short beep and two consecutive beeps mean a non-corresponding code — keep stepping. To cancel the code display, hold TIMER CANCEL down for 5 seconds again; it also cancels itself if no button is pressed for 1 minute. On wired and VRV wireless (BRC4C82-type) controllers the route is the INSPECTION/TEST button: pressing it enters inspection mode, the inspection display blinks, the operation lamp flashes and the malfunction code plus the number of the faulted unit are shown. You then step the unit number with the programming timer buttons until the unit beeps (3 short beeps = run the full procedure for that unit, 1 short beep = skip to the code steps, 1 long beep = normal state), set the first character of the code with the mode selector, step it with the timer buttons until the unit gives 2 beeps, then set the second character the same way until 1 long beep fixes the code. On VRV outdoor units a technician can also read the code in the outdoor PCB's monitor mode (BS1 MODE / BS2 SET / BS3 RETURN buttons step through first digit, second digit and fault location on the LED/7-segment display). Whichever route you use, record the full code and the unit number before resetting anything — on group and VRV systems the unit number is half the diagnosis.

The complete Daikin air conditioner error code list

How to reset / clear error codes on Daikin air conditioners

Daikin codes are condition reports, not latches to be cleared by ritual: the code clears when its condition clears. Daikin's VRV IV reference guide puts the owner-level reset plainly — depending on the level of the malfunction code, you can reset the code by pushing the ON/OFF button; if it will not reset, ask your installer. The fuller reset is a power reset at the isolator/breaker: switch the system off for several minutes (both indoor and outdoor units — on a split they are usually on one isolator), then back on and let it run; Daikin's manuals note the system does not restart instantly (a safety device holds the compressor off for about 3 minutes, and a VRV system can take up to about 12 minutes after power-on to finish its communication/addressing checks). Fault history is separate from the live code: on wired remote controllers the stored malfunction history shown in inspection (check) mode is cleared deliberately — hold the ON/OFF button for 5 seconds or more while in inspection mode, and the code flashes twice, changes to '00' (normal) and the unit number to '0' before the display returns to normal mode. Never clear history before you have written the code down, and never treat a reset as a repair: a code that returns after a clean power reset is a confirmed, present fault.

How to diagnose any Daikin air conditioner code

Work the problem in this order — and stop where refrigerant, compressors or mains wiring begin, because those are licensed work: (1) record the code exactly as displayed, including whether it came from the indoor display, the wired/wireless remote check mode, or an LED pattern on the outdoor unit — the three are different reports; (2) check the homeowner basics first: the air filter (a matted filter ices coils and imitates sensor and refrigerant faults), the condensate drain and float switch, the outdoor coil clear of leaves and debris, and both breakers fully on; (3) power-cycle once at the breaker, then run the mode the code interrupted and watch the sequence — indoor fan, outdoor fan, compressor start — because the stage that never starts names the fault family; (4) on mini-splits, retrieve the stored check code with the remote's diagnosis function before clearing anything, and write down the full code including its letter family; (5) a code that returns in the same mode is an active fault. Refrigerant charge, sealed-system and board-level work is professional work — an undercharged system re-iced after a reset is being damaged, not cured.

How Daikin's letter-family code system works — and how to read a code from the remote

Daikin organises every malfunction code as a letter plus one character, and the letter is the address of the fault. A is the indoor unit's own hardware: its PCB (A1), its drain-level system (A3), its fan motor (A6), its swing flap (A7), its expansion valve (A9) and its capacity setting (AJ), with AF and AH covering the drain/humidifier and dust-collector options. C is the indoor unit's senses — the thermistors: C4 and C5 watch the indoor coil's liquid and gas pipes, C9 reads the incoming room air, CA the discharged air, CJ the sensor inside the remote controller itself, and C1 is the one C that is not a sensor but a transmission failure between the indoor unit's main and sub PCBs. E moves outdoors to events: the outdoor PCB (E1), the high-pressure switch tripping (E3), low pressure (E4), compressor lock (E5/E6), the outdoor fan (E7) and the outdoor expansion valve (E9). F is the refrigerant circuit's temperature story — discharge temperature too high (F3), overcharge or high-pressure control (F6). H is mostly the outdoor unit's watchdogs and signals: the pressure switches themselves failing (H3/H4, as opposed to E3/E4 where a healthy switch reports genuinely bad pressure), the fan's position signal (H7) and the outdoor air thermistor (H9); residential splits add H6 (compressor position detection) and H8 (current transformer). J is the outdoor sensor shelf — thermistors J3 to J9 for discharge, suction, coil and subcooling temperatures, JA/JC for the pressure sensors, J1/J2 for the combined pressure and current sensors. L is the inverter: heatsink overheating (L4), output overcurrent (L5), compressor overload (L8) and failed start-up (L9), control-to-inverter transmission (LC). P is power and sensing around the inverter — supply imbalance (P1), the switch-box and fin thermistors (P3/P4), the outdoor capacity setting (PJ). U, finally, is the system talking to itself: refrigerant shortage (U0), supply phase and voltage (U1/U2), transmission between indoor and outdoor units (U4), between remote and indoor unit (U5), between outdoor units (U7), wrong combinations and addressing (UA/UC/UF/UH). Reading a code needs no tools beyond the remote the unit came with. On a residential wireless remote, hold TIMER CANCEL for 5 seconds and the temperature display starts flashing codes from 00; press TIMER CANCEL repeatedly to step through the list while the indoor unit beeps its verdicts — a long continuous beep marks the stored malfunction, while a short beep plus two consecutive beeps means 'not this one, keep going'. On wired and VRV controllers, the INSPECTION/TEST button opens inspection mode, which shows the code and, crucially on multi-unit systems, the number of the unit that reported it. Two habits make any code twice as useful: write down the unit number with the code, and never clear the fault history (on a wired controller, holding ON/OFF for 5 seconds inside inspection mode) before the code is recorded — the history is often the only witness an intermittent fault leaves behind. VRV adds one more layer: many system codes carry sub-codes (UF publishes a numbered list of them), and the outdoor unit's monitor mode can show the fault's location — master, slave or a named indoor unit — so on a VRV system the complete report is code, sub-code and location together.

Split, SkyAir or VRV? Scope, model variation, and which Daikin codes an owner may touch

One code system serves three rather different machines, and knowing which one you own explains most of the contradictions between Daikin code lists online. Residential split systems (Daikin's RA platform — the wall-mounted units in most homes) print a short fault-diagnosis table in the operation manual: roughly two dozen codes the remote can report, including A5 (high-pressure control or freeze-up protection) and the H6/H8 pair, which exist because a home inverter split watches its compressor's position and current directly. SkyAir — the light-commercial singles and twins under ceilings and in shops — carries a longer chart in its installation manual (the FVQ-C manual's section 12-2 runs from A1 to UJ), adding the full J-sensor shelf, the L-inverter family and the P codes. VRV, the multi-split commercial platform, carries the longest list of all, and adds what a networked system needs: E2's earth-leakage detection, U3 (check operation not yet executed), U7 for outdoor-to-outdoor transmission, U9 for faults in another system sharing the network, and detailed UF sub-codes that name the exact wiring error found at initialisation. The overlaps are real but not total: VRV IV has no A5 and no E6 because it has neither a freeze-up protector circuit of the RA type nor a standard (non-inverter) compressor, and a home split will never show U3 or U7 because it has no check operation and no second outdoor unit. So the chart in your own model's manual outranks every generic list — including this site's table, which merges the platforms and flags the platform-specific meanings where Daikin's documents give them. The owner/pro line falls where Daikin's own documents put it. Owner territory, because the manuals themselves walk you through it: reading the code with the remote's diagnosis function, cleaning the indoor filters (the honest fix behind many A5s), clearing leaves and obstructions from the outdoor unit's air path (behind many E3/L3/L4 events), checking that a condensate drain outlet is not blocked, replacing remote batteries, and one clean power reset at the isolator. Professional territory, because everything there is refrigerant, compressor or inverter: every U0 and E4 (charge and pressure), every E3 that survives an airflow clean, all of E5/E6/H6/L5/L8/L9 (compressor and its drive), E1/A1 and the L1/LC board codes, all thermistor and pressure-sensor codes in the C and J families once a reset has failed (the parts are cheap; locating and proving them is the job), and every U-family wiring or combination fault beyond the one allowed reset. The dividing question is simple: if the fix requires opening the outdoor unit or the refrigerant circuit, it is not an owner fix — it is the information you hand the technician, code and unit number included, so the first visit is the repair visit. One last scope rule follows from all of this: a code's presence in a generic internet list never proves your model can produce it, so a code your own manual does not list is a reason to re-run the remote diagnosis carefully before paying anyone to chase it.

Less common and model-specific codes

Search data shows owners also meet these codes on Daikin air conditioners: A4, A8, AA, C3, C6, C7, CC, CH, E0, F4, H0, HA, U6. They are not part of the core code list Daikin publishes for most models — several are series-specific, abbreviated display readings, or codes carried over from a sister platform — so we do not publish meanings for them rather than guess. Treat them by symptom: note what the machine was doing when the code appeared (filling, draining, heating, spinning), run one full power cycle (5 minutes off), and if the code returns, match the symptom to the closest documented family in the table above and check the tech sheet stored inside your machine for the model-specific definition.

Frequently asked questions

Related guides

Facts on this page were checked against manufacturer documentation: www.daikin.com.mt · daikinac.com · www.daikin.ch · www.manualshelf.com · www.manualshelf.com · www.manualshelf.com · mcgrp.ru · mcgrp.ru · dwt-front-dev.daikincomfort.com