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Error Message F27

Valid for S300, S400, S600, S700

Display Meaning Possible cause Measure S300/S700 Measure S400/S600
F27  STO Error
AS Error
The  STO (AS) enable was switched at the same time as or later than the amplifier-enable.  Consider Switch On sequence STO and Enable (see instructions manual)  Consider Switch On sequence AS and Enable (see instructions manual) 
Cable fault Check wiring, measure cable resistance.  Check wiring, measure cable resistance.