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Fujitsu Air Conditioner 11 Error Code

Indoor and outdoor units can't communicate. What it means, which models show it, and how to clear it, easiest fix first.

FujitsuAll Fujitsu air conditioner codes

11
May need a pro

The indoor and outdoor units aren't exchanging signals. A power interruption, the outdoor unit having no power, loose or damaged connecting wiring, or a board fault in either unit are the usual causes.

Compatible models

Fujitsu doesn't publish a model list for this code; it appears on Fujitsu air conditioners with a digital display. Check your owner's manual.

Also shown as

Lamp pattern: on models that show faults with the indicator lamps, Fujitsu's tables for many current wall-mounted (RL/RLS/RLX, LZAH), compact ducted (RGLX) and RLF multi-zone units show this code as the Operation lamp flashing 1 time and the Timer lamp flashing 1 time, with the Economy lamp marked "continuous". Other Fujitsu units, such as universal-mount and ceiling-suspended models, use different lamps. A wired controller shows the code as a number. Fujitsu's FGLair app table lists sub-codes 11.1 to 11.4, and service manuals write it as E: 11. On the older code set this fault used 01 or 13, and an old-style 11 means a model or memory (EEPROM) mismatch instead. Fujitsu's older code set (for example older 9CQ/9RLQ/12CQ wall units, RMLQ-series multi-zone heads and some RCLX ceiling cassettes) uses different numbers for many faults, so always check the manual for your model.

Difficulty

Try the basic checks, but the usual fix is a technician's job.

Safety first: unplug the air conditioner (or switch off its breaker) before touching filters, hoses or panels. If you smell burning or gas, or see water near the outlet, stop and call a professional.

How to fix Fujitsu 11

  1. Reset the power at the breaker

    Switch the system off with the remote, then turn off its circuit breaker in your home's main panel. Wait about 5 minutes, switch the breaker back on and restart the unit. If the code appeared after a storm or power cut, restarting both units together sometimes clears it.

  2. Check the outdoor unit's breaker

    Many systems have a separate breaker for the outdoor unit. Make sure it is on. If it trips again right away, leave it off and call for service.

When to call a technician

If the code returns, a technician needs to check the wiring and voltage between the units and the boards. Don't open the terminal covers or the outdoor unit's electrical panel.

Parts linked to 11

These are the parts most often behind this code. Tap one to see what it does and the signs it is failing.

Order parts by your full model number so they fit.

Frequently asked questions

What does 11 mean on a Fujitsu air conditioner?

The indoor and outdoor units aren't exchanging signals. A power interruption, the outdoor unit having no power, loose or damaged connecting wiring, or a board fault in either unit are the usual causes.

Which Fujitsu models show the 11 code?

Fujitsu doesn't publish a model list for this code; it appears on Fujitsu air conditioners with a digital display. Check your owner's manual.

Can I fix Fujitsu 11 myself?

Only the basic checks. You can safely try the steps above, but 11 usually points to a part or fault that needs a technician.

What if 11 keeps coming back?

A code that returns after a reset and the checks above usually means a part is wearing out. Note when 11 appears (which cycle, how often) and have your model number ready; it helps a technician bring the right part on the first visit.

Other Fujitsu air conditioner codes

Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.

Sources we checked