Answer:
When both the red and green lights on your Fujitsu mini-split are flashing, it typically indicates a system error that requires immediate attention. In our experience, this alert often points to a serious issue such as a compressor fault, sensor malfunction, or communication error between the indoor and outdoor units. The flashing lights correspond to a fault code, which can help diagnose the exact problem. Start by checking for obvious issues like blocked airflow or power interruptions, but for more complex faults, it’s best to contact a certified HVAC technician to assess the situation.
More On: Fujitsu Mini-Split Red and Green Light Flashing
Flashing red and green lights are a diagnostic feature in Fujitsu mini-splits, signalling that the system has detected a problem. In many cases, these lights flash in a specific sequence that corresponds to an error code, which you can find in your unit’s manual. Common causes we’ve seen include sensor errors, refrigerant leaks, or problems with the communication cable connecting the indoor and outdoor units.
Resetting the system by turning it off at the breaker for a few minutes can sometimes resolve minor glitches. However, if the lights resume flashing after the reset, it’s important to address the issue promptly to avoid further damage to the system. Regular maintenance, such as cleaning filters and inspecting outdoor unit airflow, can help prevent these types of errors. For persistent problems, professional diagnosis and repair are essential.
