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Error Code
If your Fujitsu air conditioning unit displays the A5 error code, it is related to high-pressure control in heating mode or freeze-up protection in cooling mode. This error occurs when the system detects irregular pressure levels within the system.
Obstructions can cause the system to overheat or freeze.
Low refrigerant can result in abnormal pressure readings.
The pressure sensors may be malfunctioning or providing incorrect readings.
Running the system for extended periods without proper maintenance can cause the system to fail.
Ensure that there are no blockages or dirt on the filters and coils.
Ensure that refrigerant levels are sufficient for optimal operation.
Have a technician check the pressure sensors for any malfunctions.
Power cycle the system to see if the error clears.
