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Fujitsu Air Conditioner A3 Error Code

Compressor temperature too high. What it means, which models show it, and how to clear it, easiest fix first.

FujitsuAll Fujitsu air conditioner codes

A3
May need a pro

The compressor body reached about 226°F (108°C) or more twice within a day, so the unit stopped. Fujitsu lists a service valve that isn't fully open, an expansion valve or strainer problem, an outdoor fan or coil problem, or a faulty compressor sensor as 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 10 times and the Timer lamp flashing 3 times, 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 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 A3

  1. Clear around the outdoor unit

    With the breaker off, remove leaves, grass clippings, snow or anything stored against the outdoor unit, and keep about 2 ft (60 cm) clear on all sides. Brush loose debris off the outside of the coil fins by hand or with a soft brush; do not use a pressure washer or bend the fins.

  2. 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 returns within a few minutes, write it down for the technician.

When to call a technician

If A3 returns, a licensed HVAC technician needs to check the refrigerant circuit and compressor.

Parts linked to A3

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 A3 mean on a Fujitsu air conditioner?

The compressor body reached about 226°F (108°C) or more twice within a day, so the unit stopped. Fujitsu lists a service valve that isn't fully open, an expansion valve or strainer problem, an outdoor fan or coil problem, or a faulty compressor sensor as causes.

Which Fujitsu models show the A3 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 A3 myself?

Only the basic checks. You can safely try the steps above, but A3 usually points to a part or fault that needs a technician.

What if A3 keeps coming back?

A code that returns after a reset and the checks above usually means a part is wearing out. Note when A3 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