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Alexander ChungAug 8, 2025
What to do if my Fujitsu AS G07KGTA shows a serial communication error (Serial Reverse Transfer Error)?
- RRebecca StevensAug 8, 2025
If your Fujitsu Air Conditioner displays a serial communication error (Serial Reverse Transfer Error), you can try the following: * Reset the power and operate the unit again. A connection failure might be the cause. * Inspect the connection lines between the indoor and outdoor units for any looseness or disconnections. If any issues are found, correct them. * Verify the power supply voltage. It should measure between AC207V and AC253V at the outdoor unit terminals L-N. * Check the serial signal (Reverse Transfer Signal) at the outdoor unit terminals 1-3. The indicated value should swing between AC90V and AC270V. If abnormal, inspect the outdoor fan motor. If the fan motor is faulty, replace both the motor and the Main PCB. If the fan motor is working, replace the Main PCB.
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