Mitsubishi Electric mini-split error codes

By Jason Dearmin · Last reviewed November 14, 2026

Mitsubishi Electric wall-mounted mini-splits report faults in more than one way, and the method depends on the series. On MSZ-GX units you read a two-character code from the wireless remote while the indoor operation-indicator lamp is blinking. On MSZ-FH, MSZ-FS and MSZ-GL / MSY-GL units the service manuals tell you to count flashes of that same lamp. The tables below keep those two methods separate and say which series each row comes from.

How to read the display

MSZ-GX letter codes: with the remote off, point it at the indoor unit and hold CHECK with a fine-tipped object until the indoor unit beeps and the remote shows 00. Press the up or down buttons to step through codes. Two beeps means the unit has the error for the code shown; one beep means no error for that code; no beep means the diagnosis failed, so try again. The manual says to stop using the air conditioner, turn off the breaker and contact your dealer when the unit has an error. Pressing other buttons cancels the display. If the remote is operated while the lamp is not blinking, the code shown might not be accurate.

MSZ-FH, MSZ-FS and MSZ-GL / MSY-GL flash counts: count flashes of the left or upper OPERATION INDICATOR lamp. A steady rapid blink (0.5 seconds on, 0.5 seconds off) is one pattern. The numbered patterns flash that many times and then stay off for 2.5 seconds before repeating. The service manuals say to check at least two consecutive cycles. These series also have a separate "failure mode recall" function whose flash counts do not match the table below; the comparison table is the ordinary troubleshooting check table (section 9-4), not the recall table. A longer walkthrough for the GL lamp is on this site's MSZ/MSY-GL blinking light page.

Mitsubishi Electric code table

Letter-code source: Mitsubishi Electric MSZ-GX operation manual, "Error Code Display Mode" table (page En-18). Rows are grouped as in the manual: indoor unit codes first, then outdoor unit codes. H6 is not in this GX table.

OPERATION INDICATOR flash patterns on FH, FS and GL series

The service manuals for MSZ-FH (OBH683C, section 9-4), MSZ-FS (OBH872A, section 9-4) and MSZ-GL / MSY-GL (OBH732C, section 9-4) use flash counts on the indoor OPERATION INDICATOR, not the two-character remote codes in the table above. FH and FS call the lamp the left lamp; the GL manual calls it the upper lamp. The meanings below use the manuals' wording, condensed. Where the three documents agree, the row lists all three series. Differences are called out in the last column.

For a longer GL-only walkthrough of the lamp, including the difference between the ordinary table and failure mode recall, see the MSZ/MSY-GL blinking light page.

MXZ multi-zone outdoor units

The MXZ-2C20NAHZ, MXZ-3C24NAHZ and MXZ-3C30NAHZ service manual (OBH702A) documents faults with LED1 and LED2 on the outdoor control board, not with the two-character remote codes in the first table. Indoor heads attached to an MXZ still follow that indoor unit's own lamp or remote table. If you have an MXZ outdoor unit, use OBH702A (or the edition that matches your model) together with the indoor manual.