Daikin mini-split error codes: FTXC, FTX-B, AXVJU and FTX-N/U series

By Jason Dearmin · Last reviewed November 14, 2026

Daikin wall-mounted and ducted mini-splits report faults as a two-character code on the wireless remote, and most of the codes mean the same thing across series. We read the error tables in four Daikin service manuals that span the FTXC, FTX-B, 19 Series AXVJU and FTX-N/U product lines and merged them into one table, keeping each manual's wording where it differs. These are service manuals, so the full flow charts assume a technician with meters; the code list still tells you which part of the system the unit is complaining about.

How to read the display

Codes starting with A or C are indoor unit faults. Codes starting with E, F, H, J, L or P are outdoor unit faults. U codes are system-level: voltage, communication and installation.

Reading the code on an ARC480-series remote (SiUS091601ED, method 1): hold the TIMER CANCEL button for 5 seconds until 00 appears in the temperature display, then press TIMER CANCEL repeatedly until the unit gives a long beep. The code on the screen at the long beep is the stored error. A short beep or two consecutive beeps mean the code shown is not the one. To return to normal, hold TIMER CANCEL for 5 seconds, or leave the remote alone for 60 seconds. The manual notes that not every code shows with this method and gives a second method for technicians. The FTX-B manual describes the same TIMER CANCEL scroll for its remote.

Every service manual tells technicians to turn the power switch off before connecting or disconnecting connectors, because parts can be damaged. That is one more reason the deeper checks are not for homeowners.

Daikin code table

Sources: Daikin DAMA-SM-23-020 section 4.1 (FTXC); DAMA-SM-23-006 section 4.1 (FTX-B); AXVJU service manual section 3.3 (AXVJU); SiUS091601ED Part 6 section 4 (FTX-N/U, FVXS, FDMQ). Where manuals word a code differently, the AXVJU or SiUS wording is shown in quotes.

Which manual covers my unit?

Find the model number on the rating label on the side of the indoor unit or the outdoor unit. If the first letters and the suffix do not match a row above, use the code table in your own unit's manual. For example, the FTX-B manual also prints a longer generic "error code definition" list that includes codes which do not apply to every model, so we only used its section 4.1 table here.

Detailed explanations

• Daikin mini-split error H6: position sensor abnormality (compressor start-up failure)
• Daikin mini-split error U4: signal transmission error between indoor and outdoor unit