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Fujitsu Air Conditioner A5 Error Code
Low pressure error. Here is what it means and how to clear it, easiest fix first.
The outdoor unit saw very low suction pressure for about 5 minutes at a time, several times within a couple of hours, so it shut down to protect the compressor. Low refrigerant from a leak, a service valve that isn't fully open, a blocked strainer, or a faulty expansion valve or pressure sensor are the usual causes.
Lamp pattern: on models that show faults with the indicator lamps, Fujitsu's tables for RGLX compact ducted, RL/RLS/RLX wall-mounted and RLF multi-zone units show this code as the Operation lamp flashing 10 times and the Timer lamp flashing 5 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.
How to fix Fujitsu A5
Clean the air filters
Turn the system off and switch off its breaker. Lift the front panel of the indoor unit, slide out the mesh filters, and rinse them under lukewarm water or vacuum them gently. Let them dry fully in the shade before refitting them, then restore power.
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, leave the system off until it has been checked.
When to call a technician
A5 needs a licensed HVAC technician to find and fix the cause. Never try to recharge the system yourself.
Parts that commonly cause A5
- refrigerant leak repair
- expansion valve
- pressure sensor
Order parts by your exact model number so they fit.
Other Fujitsu air conditioner codes
- 11Indoor and outdoor units can't communicate
- 12Wired remote controller communication error
- 18External or Wi-Fi adapter communication error
- 32Indoor unit control board error
- 35MANUAL AUTO button stuck
- 41Room temperature sensor error
- 42Indoor coil temperature sensor error
- 51Indoor fan motor error
- 53Drain pump error
- 62Outdoor unit main board error
- 63Inverter error
- 65IPM (power module) protection
- 71-74Outdoor unit temperature sensor error
- 94Compressor overcurrent (trip detection)
- 95Compressor motor control error
- 97Outdoor fan motor error
- 99Reversing (4-way) valve error
- A1Discharge temperature too high
- A3Compressor temperature too high
Frequently asked questions
What does A5 mean on a Fujitsu air conditioner?
The outdoor unit saw very low suction pressure for about 5 minutes at a time, several times within a couple of hours, so it shut down to protect the compressor. Low refrigerant from a leak, a service valve that isn't fully open, a blocked strainer, or a faulty expansion valve or pressure sensor are the usual causes.
Can I fix Fujitsu A5 myself?
Only the basic checks. You can safely try the steps above, but A5 usually points to a part or fault that needs a technician.
What if A5 keeps coming back?
A code that returns after a reset and the checks above usually means a part is wearing out. Note when A5 appears (which cycle, how often) and have your model number ready; it helps a technician bring the right part on the first visit.
Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.